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(3x+6)+(4x+21)+90=180
We move all terms to the left:
(3x+6)+(4x+21)+90-(180)=0
We add all the numbers together, and all the variables
(3x+6)+(4x+21)-90=0
We get rid of parentheses
3x+4x+6+21-90=0
We add all the numbers together, and all the variables
7x-63=0
We move all terms containing x to the left, all other terms to the right
7x=63
x=63/7
x=9
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