x=3.5(90-x)

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Solution for x=3.5(90-x) equation: 



x=3.5(90-x)

We move all terms to the left:

x-(3.5(90-x))=0

We add all the numbers together, and all the variables

x-(3.5(-1x+90))=0



We calculate terms in parentheses: -(3.5(-1x+90)), so:

3.5(-1x+90)

We multiply parentheses

-3.5x+315

Back to the equation:

-(-3.5x+315)



We get rid of parentheses

x+3.5x-315=0

We add all the numbers together, and all the variables

4.5x-315=0

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

4.5x=315

x=315/4.5

x=70

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