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4(x-2)+3(x+5)=28
We move all terms to the left:
4(x-2)+3(x+5)-(28)=0
We multiply parentheses
4x+3x-8+15-28=0
We add all the numbers together, and all the variables
7x-21=0
We move all terms containing x to the left, all other terms to the right
7x=21
x=21/7
x=3
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