7(90-x)-4(180-x)=30

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Solution for 7(90-x)-4(180-x)=30 equation: 



7(90-x)-4(180-x)=30

We move all terms to the left:

7(90-x)-4(180-x)-(30)=0

We add all the numbers together, and all the variables

7(-1x+90)-4(-1x+180)-30=0

We multiply parentheses

-7x+4x+630-720-30=0

We add all the numbers together, and all the variables

-3x-120=0

We move all terms containing x to the left, all other terms to the right

-3x=120

x=120/-3

x=-40

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