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140+0.40x=50+0.70x
We move all terms to the left:
140+0.40x-(50+0.70x)=0
We add all the numbers together, and all the variables
0.40x-(0.70x+50)+140=0
We get rid of parentheses
0.40x-0.70x-50+140=0
We add all the numbers together, and all the variables
-0.3x+90=0
We move all terms containing x to the left, all other terms to the right
-0.3x=-90
x=-90/-0.3
x=+300
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