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150-42x=10-2x
We move all terms to the left:
150-42x-(10-2x)=0
We add all the numbers together, and all the variables
-42x-(-2x+10)+150=0
We get rid of parentheses
-42x+2x-10+150=0
We add all the numbers together, and all the variables
-40x+140=0
We move all terms containing x to the left, all other terms to the right
-40x=-140
x=-140/-40
x=3+1/2
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