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12+4x-7=11x-9
We move all terms to the left:
12+4x-7-(11x-9)=0
We add all the numbers together, and all the variables
4x-(11x-9)+5=0
We get rid of parentheses
4x-11x+9+5=0
We add all the numbers together, and all the variables
-7x+14=0
We move all terms containing x to the left, all other terms to the right
-7x=-14
x=-14/-7
x=+2
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