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2(x+20)+3(x+15)=-15
We move all terms to the left:
2(x+20)+3(x+15)-(-15)=0
We add all the numbers together, and all the variables
2(x+20)+3(x+15)+15=0
We multiply parentheses
2x+3x+40+45+15=0
We add all the numbers together, and all the variables
5x+100=0
We move all terms containing x to the left, all other terms to the right
5x=-100
x=-100/5
x=-20
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