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(5+x)+12-3x=13
We move all terms to the left:
(5+x)+12-3x-(13)=0
We add all the numbers together, and all the variables
(x+5)-3x+12-13=0
We add all the numbers together, and all the variables
-3x+(x+5)-1=0
We get rid of parentheses
-3x+x+5-1=0
We add all the numbers together, and all the variables
-2x+4=0
We move all terms containing x to the left, all other terms to the right
-2x=-4
x=-4/-2
x=+2
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