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(3x+11)+(-10x-12)=45*2
We move all terms to the left:
(3x+11)+(-10x-12)-(45*2)=0
We add all the numbers together, and all the variables
(3x+11)+(-10x-12)-90=0
We get rid of parentheses
3x-10x+11-12-90=0
We add all the numbers together, and all the variables
-7x-91=0
We move all terms containing x to the left, all other terms to the right
-7x=91
x=91/-7
x=-13
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