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0.15x+2.50+1.75=x
We move all terms to the left:
0.15x+2.50+1.75-(x)=0
We add all the numbers together, and all the variables
-0.85x+4.25=0
We move all terms containing x to the left, all other terms to the right
-0.85x=-4.25
x=-4.25/-0.85
x=+5
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