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140+0.70x=60+0.90x
We move all terms to the left:
140+0.70x-(60+0.90x)=0
We add all the numbers together, and all the variables
0.70x-(0.90x+60)+140=0
We get rid of parentheses
0.70x-0.90x-60+140=0
We add all the numbers together, and all the variables
-0.2x+80=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-80
x=-80/-0.2
x=+400
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