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2(x+10)+3(x+20)=5
We move all terms to the left:
2(x+10)+3(x+20)-(5)=0
We multiply parentheses
2x+3x+20+60-5=0
We add all the numbers together, and all the variables
5x+75=0
We move all terms containing x to the left, all other terms to the right
5x=-75
x=-75/5
x=-15
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