Question

`\sf 45-4x=75-6x`

Answer 1

`\sf \longmapsto45 - 4x = 75 - 6x`

`\sf \longmapsto45 - 75 =- 6x + 4x`

`\sf \longmapsto -30 =- 2x`

`\sf \longmapsto ( 30)/(2) = x`

`\sf \longmapsto 15 = x`

`\sf \longmapsto \: x ≈15`

Answer 2

=> 45 - 4x = 75 - 6x

=> 45 - 75 = -6x + 4x

=> -30 = -2x

=> x = 30/2

=> x = 15