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140+0.8x=70+0.9x
We move all terms to the left:
140+0.8x-(70+0.9x)=0
We add all the numbers together, and all the variables
0.8x-(0.9x+70)+140=0
We get rid of parentheses
0.8x-0.9x-70+140=0
We add all the numbers together, and all the variables
-0.1x+70=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-70
x=-70/-0.1
x=+700
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