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4x-12-7=-15x
We move all terms to the left:
4x-12-7-(-15x)=0
We add all the numbers together, and all the variables
4x-(-15x)-19=0
We get rid of parentheses
4x+15x-19=0
We add all the numbers together, and all the variables
19x-19=0
We move all terms containing x to the left, all other terms to the right
19x=19
x=19/19
x=1
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