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12x+4-13x-15=18x+4
We move all terms to the left:
12x+4-13x-15-(18x+4)=0
We add all the numbers together, and all the variables
-1x-(18x+4)-11=0
We get rid of parentheses
-1x-18x-4-11=0
We add all the numbers together, and all the variables
-19x-15=0
We move all terms containing x to the left, all other terms to the right
-19x=15
x=15/-19
x=-15/19
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