2/5 x - 2/3 y = 30 when y = 15 then
2/5 x - 2/3 * 15 = 30
2/5 x - 10 = 30
2/5 x = 40
2x = 40 *5
2x = 200
Divide both sides by 2
x = 200/2
= 100
1.6m questions
2.0m answers