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8x-15x-30x=51x+53x+31x-72
We move all terms to the left:
8x-15x-30x-(51x+53x+31x-72)=0
We add all the numbers together, and all the variables
8x-15x-30x-(135x-72)=0
We add all the numbers together, and all the variables
-37x-(135x-72)=0
We get rid of parentheses
-37x-135x+72=0
We add all the numbers together, and all the variables
-172x+72=0
We move all terms containing x to the left, all other terms to the right
-172x=-72
x=-72/-172
x=18/43
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