90=5x+4(18-x)

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Solution for 90=5x+4(18-x) equation: 



90=5x+4(18-x)

We move all terms to the left:

90-(5x+4(18-x))=0

We add all the numbers together, and all the variables

-(5x+4(-1x+18))+90=0



We calculate terms in parentheses: -(5x+4(-1x+18)), so:

5x+4(-1x+18)

We multiply parentheses

5x-4x+72

We add all the numbers together, and all the variables

x+72

Back to the equation:

-(x+72)



We get rid of parentheses

-x-72+90=0

We add all the numbers together, and all the variables

-1x+18=0

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

-x=-18

x=-18/-1

x=+18

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