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4(x-5)+3(x-10)+2(x-15)=100
We move all terms to the left:
4(x-5)+3(x-10)+2(x-15)-(100)=0
We multiply parentheses
4x+3x+2x-20-30-30-100=0
We add all the numbers together, and all the variables
9x-180=0
We move all terms containing x to the left, all other terms to the right
9x=180
x=180/9
x=20
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