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5x+2(4x-19)=-21
We move all terms to the left:
5x+2(4x-19)-(-21)=0
We add all the numbers together, and all the variables
5x+2(4x-19)+21=0
We multiply parentheses
5x+8x-38+21=0
We add all the numbers together, and all the variables
13x-17=0
We move all terms containing x to the left, all other terms to the right
13x=17
x=17/13
x=1+4/13
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