5x=4(90-x)

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Solution for 5x=4(90-x) equation: 



5x=4(90-x)

We move all terms to the left:

5x-(4(90-x))=0

We add all the numbers together, and all the variables

5x-(4(-1x+90))=0



We calculate terms in parentheses: -(4(-1x+90)), so:

4(-1x+90)

We multiply parentheses

-4x+360

Back to the equation:

-(-4x+360)



We get rid of parentheses

5x+4x-360=0

We add all the numbers together, and all the variables

9x-360=0

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

9x=360

x=360/9

x=40

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