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.75x+0.1x=x-7.5
We move all terms to the left:
.75x+0.1x-(x-7.5)=0
We add all the numbers together, and all the variables
0.85x-(x-7.5)=0
We get rid of parentheses
0.85x-x+7.5=0
We add all the numbers together, and all the variables
-0.15x+7.5=0
We move all terms containing x to the left, all other terms to the right
-0.15x=-7.5
x=-7.5/-0.15
x=+50
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