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140+0.50x=60+0.90x
We move all terms to the left:
140+0.50x-(60+0.90x)=0
We add all the numbers together, and all the variables
0.50x-(0.90x+60)+140=0
We get rid of parentheses
0.50x-0.90x-60+140=0
We add all the numbers together, and all the variables
-0.4x+80=0
We move all terms containing x to the left, all other terms to the right
-0.4x=-80
x=-80/-0.4
x=+200
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