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130+0.40x=50+0.50x
We move all terms to the left:
130+0.40x-(50+0.50x)=0
We add all the numbers together, and all the variables
0.40x-(0.50x+50)+130=0
We get rid of parentheses
0.40x-0.50x-50+130=0
We add all the numbers together, and all the variables
-0.1x+80=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-80
x=-80/-0.1
x=+800
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