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(-46+2x)+(x+34)=90
We move all terms to the left:
(-46+2x)+(x+34)-(90)=0
We add all the numbers together, and all the variables
(2x-46)+(x+34)-90=0
We get rid of parentheses
2x+x-46+34-90=0
We add all the numbers together, and all the variables
3x-102=0
We move all terms containing x to the left, all other terms to the right
3x=102
x=102/3
x=34
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