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85-4x=75-3.50x
We move all terms to the left:
85-4x-(75-3.50x)=0
We add all the numbers together, and all the variables
-4x-(-3.5x+75)+85=0
We get rid of parentheses
-4x+3.5x-75+85=0
We add all the numbers together, and all the variables
-0.5x+10=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-10
x=-10/-0.5
x=+20
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