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0.45x+0.3x=x-17.5
We move all terms to the left:
0.45x+0.3x-(x-17.5)=0
We add all the numbers together, and all the variables
0.75x-(x-17.5)=0
We get rid of parentheses
0.75x-x+17.5=0
We add all the numbers together, and all the variables
-0.25x+17.5=0
We move all terms containing x to the left, all other terms to the right
-0.25x=-17.5
x=-17.5/-0.25
x=+70
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