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3.5=-x-0.75x
We move all terms to the left:
3.5-(-x-0.75x)=0
We add all the numbers together, and all the variables
-(-1.75x)+3.5=0
We get rid of parentheses
1.75x+3.5=0
We move all terms containing x to the left, all other terms to the right
1.75x=-3.5
x=-3.5/1.75
x=-2
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