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7x=19x-72
We move all terms to the left:
7x-(19x-72)=0
We get rid of parentheses
7x-19x+72=0
We add all the numbers together, and all the variables
-12x+72=0
We move all terms containing x to the left, all other terms to the right
-12x=-72
x=-72/-12
x=+6
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