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210(x-12)+140(x+18)=70
We move all terms to the left:
210(x-12)+140(x+18)-(70)=0
We multiply parentheses
210x+140x-2520+2520-70=0
We add all the numbers together, and all the variables
350x-70=0
We move all terms containing x to the left, all other terms to the right
350x=70
x=70/350
x=1/5
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