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4x+7x+12=15+23+29
We move all terms to the left:
4x+7x+12-(15+23+29)=0
We add all the numbers together, and all the variables
4x+7x+12-67=0
We add all the numbers together, and all the variables
11x-55=0
We move all terms containing x to the left, all other terms to the right
11x=55
x=55/11
x=5
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