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5x+2(x-1)=19
We move all terms to the left:
5x+2(x-1)-(19)=0
We multiply parentheses
5x+2x-2-19=0
We add all the numbers together, and all the variables
7x-21=0
We move all terms containing x to the left, all other terms to the right
7x=21
x=21/7
x=3
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