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x+4(x+3)=20
We move all terms to the left:
x+4(x+3)-(20)=0
We multiply parentheses
x+4x+12-20=0
We add all the numbers together, and all the variables
5x-8=0
We move all terms containing x to the left, all other terms to the right
5x=8
x=8/5
x=1+3/5
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