90=4x-1+3x+7

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Solution for 90=4x-1+3x+7 equation: 



90=4x-1+3x+7

We move all terms to the left:

90-(4x-1+3x+7)=0

We add all the numbers together, and all the variables

-(7x+6)+90=0

We get rid of parentheses

-7x-6+90=0

We add all the numbers together, and all the variables

-7x+84=0

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

-7x=-84

x=-84/-7

x=+12

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