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10(x+4)+3(x+5)=120
We move all terms to the left:
10(x+4)+3(x+5)-(120)=0
We multiply parentheses
10x+3x+40+15-120=0
We add all the numbers together, and all the variables
13x-65=0
We move all terms containing x to the left, all other terms to the right
13x=65
x=65/13
x=5
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