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8x+5x=21-31
We move all terms to the left:
8x+5x-(21-31)=0
We add all the numbers together, and all the variables
8x+5x-(-10)=0
We add all the numbers together, and all the variables
13x+10=0
We move all terms containing x to the left, all other terms to the right
13x=-10
x=-10/13
x=-10/13
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