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7x+4-13x=1-12
We move all terms to the left:
7x+4-13x-(1-12)=0
We add all the numbers together, and all the variables
7x-13x+4-(-11)=0
We add all the numbers together, and all the variables
-6x+15=0
We move all terms containing x to the left, all other terms to the right
-6x=-15
x=-15/-6
x=2+1/2
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