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70-3x=210-43x
We move all terms to the left:
70-3x-(210-43x)=0
We add all the numbers together, and all the variables
-3x-(-43x+210)+70=0
We get rid of parentheses
-3x+43x-210+70=0
We add all the numbers together, and all the variables
40x-140=0
We move all terms containing x to the left, all other terms to the right
40x=140
x=140/40
x=3+1/2
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