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X-4(2X+3)=19
We move all terms to the left:
X-4(2X+3)-(19)=0
We multiply parentheses
X-8X-12-19=0
We add all the numbers together, and all the variables
-7X-31=0
We move all terms containing X to the left, all other terms to the right
-7X=31
X=31/-7
X=-4+3/7
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