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124=2x-12+4x+7
We move all terms to the left:
124-(2x-12+4x+7)=0
We add all the numbers together, and all the variables
-(6x-5)+124=0
We get rid of parentheses
-6x+5+124=0
We add all the numbers together, and all the variables
-6x+129=0
We move all terms containing x to the left, all other terms to the right
-6x=-129
x=-129/-6
x=21+1/2
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