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20+(-3.5x)+(-1.5x)=10
We move all terms to the left:
20+(-3.5x)+(-1.5x)-(10)=0
We add all the numbers together, and all the variables
(-3.5x)+(-1.5x)+10=0
We get rid of parentheses
-3.5x-1.5x+10=0
We add all the numbers together, and all the variables
-5x+10=0
We move all terms containing x to the left, all other terms to the right
-5x=-10
x=-10/-5
x=+2
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