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5(x+2)+4(3+x)=20
We move all terms to the left:
5(x+2)+4(3+x)-(20)=0
We add all the numbers together, and all the variables
5(x+2)+4(x+3)-20=0
We multiply parentheses
5x+4x+10+12-20=0
We add all the numbers together, and all the variables
9x+2=0
We move all terms containing x to the left, all other terms to the right
9x=-2
x=-2/9
x=-2/9
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