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19+x=3x-7
We move all terms to the left:
19+x-(3x-7)=0
We get rid of parentheses
x-3x+7+19=0
We add all the numbers together, and all the variables
-2x+26=0
We move all terms containing x to the left, all other terms to the right
-2x=-26
x=-26/-2
x=+13
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