Answer
x = 15
Step-by-step explanation:
![\sf{ (40)/(x + 1) = (15)/(6) }](https://img.qammunity.org/2021/formulas/mathematics/high-school/daamf3zxo0881ty7iggk9lrizk6sp83dg3.png)
Do cross multiplication
![\dashrightarrow{ \sf{15(x + 1) = 40 * 6}}](https://img.qammunity.org/2021/formulas/mathematics/high-school/pg1yfig02mdlu9lkt0hisvy3pli9un4mzh.png)
Distribute 15 through the parentheses
![\dashrightarrow \sf \: 15x + 15 = 40 * 6](https://img.qammunity.org/2021/formulas/mathematics/high-school/y0rlauo7v0c6xyddmhlpvblocirxuxk52f.png)
Multiply the numbers : 40 and 6
![\dashrightarrow{ \sf{15x + 15 = 240}}](https://img.qammunity.org/2021/formulas/mathematics/high-school/hoypsfu4570by1ezxgcekxa5g76w6lef3q.png)
Move 15 to right hand side and change it's sign
![\dashrightarrow{ \sf{15x = 240 - 15}}](https://img.qammunity.org/2021/formulas/mathematics/high-school/hss6je0j48ix32c2br5id6xd68iqtvr38g.png)
Subtract 15 from 240
![\dashrightarrow \: \sf{15x = 225}](https://img.qammunity.org/2021/formulas/mathematics/high-school/obbm8gry8lbadsx4brotlfrcm5iwrlld66.png)
Divide both sides by 15
![\dashrightarrow{ \sf{ (15x)/(15) = (225)/(15) }}](https://img.qammunity.org/2021/formulas/mathematics/high-school/f9u2ap08gyejmhw70fa8pni3ba6jkih2at.png)
Calculate
![\dashrightarrow{ \sf{x = 15}}](https://img.qammunity.org/2021/formulas/mathematics/high-school/ddjj4m0soj5c0k9b6ifbgihbxo58mk82hi.png)
Hope I helped!
Best regards! :D