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6x-8x+18x-13x=-15-21+8+64
We move all terms to the left:
6x-8x+18x-13x-(-15-21+8+64)=0
We add all the numbers together, and all the variables
6x-8x+18x-13x-36=0
We add all the numbers together, and all the variables
3x-36=0
We move all terms containing x to the left, all other terms to the right
3x=36
x=36/3
x=12
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