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310=120+10x
We move all terms to the left:
310-(120+10x)=0
We add all the numbers together, and all the variables
-(10x+120)+310=0
We get rid of parentheses
-10x-120+310=0
We add all the numbers together, and all the variables
-10x+190=0
We move all terms containing x to the left, all other terms to the right
-10x=-190
x=-190/-10
x=+19
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