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15x-26=31-4x
We move all terms to the left:
15x-26-(31-4x)=0
We add all the numbers together, and all the variables
15x-(-4x+31)-26=0
We get rid of parentheses
15x+4x-31-26=0
We add all the numbers together, and all the variables
19x-57=0
We move all terms containing x to the left, all other terms to the right
19x=57
x=57/19
x=3
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