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3x+2x-2+2x+7x+7=19
We move all terms to the left:
3x+2x-2+2x+7x+7-(19)=0
We add all the numbers together, and all the variables
14x-14=0
We move all terms containing x to the left, all other terms to the right
14x=14
x=14/14
x=1
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