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4(x+5)+3(2x+10)=80
We move all terms to the left:
4(x+5)+3(2x+10)-(80)=0
We multiply parentheses
4x+6x+20+30-80=0
We add all the numbers together, and all the variables
10x-30=0
We move all terms containing x to the left, all other terms to the right
10x=30
x=30/10
x=3
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