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16+8x-25=-21-7x+3x
We move all terms to the left:
16+8x-25-(-21-7x+3x)=0
We add all the numbers together, and all the variables
8x-(-4x-21)+16-25=0
We add all the numbers together, and all the variables
8x-(-4x-21)-9=0
We get rid of parentheses
8x+4x+21-9=0
We add all the numbers together, and all the variables
12x+12=0
We move all terms containing x to the left, all other terms to the right
12x=-12
x=-12/12
x=-1
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