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(4+6x)+(9x-4)+90=180
We move all terms to the left:
(4+6x)+(9x-4)+90-(180)=0
We add all the numbers together, and all the variables
(6x+4)+(9x-4)+90-180=0
We add all the numbers together, and all the variables
(6x+4)+(9x-4)-90=0
We get rid of parentheses
6x+9x+4-4-90=0
We add all the numbers together, and all the variables
15x-90=0
We move all terms containing x to the left, all other terms to the right
15x=90
x=90/15
x=6
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