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0.5x+0.4=0.7x-13
We move all terms to the left:
0.5x+0.4-(0.7x-13)=0
We get rid of parentheses
0.5x-0.7x+13+0.4=0
We add all the numbers together, and all the variables
-0.2x+13.4=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-13.4
x=-13.4/-0.2
x=+67
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