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x+3(2x+4)=-19
We move all terms to the left:
x+3(2x+4)-(-19)=0
We add all the numbers together, and all the variables
x+3(2x+4)+19=0
We multiply parentheses
x+6x+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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