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4x+8+4x+7+4x=4x+4x+5x+6
We move all terms to the left:
4x+8+4x+7+4x-(4x+4x+5x+6)=0
We add all the numbers together, and all the variables
4x+4x+4x-(13x+6)+8+7=0
We add all the numbers together, and all the variables
12x-(13x+6)+15=0
We get rid of parentheses
12x-13x-6+15=0
We add all the numbers together, and all the variables
-1x+9=0
We move all terms containing x to the left, all other terms to the right
-x=-9
x=-9/-1
x=+9
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