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(4x+x)*2=124
We move all terms to the left:
(4x+x)*2-(124)=0
We add all the numbers together, and all the variables
(+5x)*2-124=0
We multiply parentheses
10x-124=0
We move all terms containing x to the left, all other terms to the right
10x=124
x=124/10
x=12+2/5
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