Solve for x
x=15
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21x-645+43x=315
Add 43x to both sides.
64x-645=315
Combine 21x and 43x to get 64x.
64x=315+645
Add 645 to both sides.
64x=960
Add 315 and 645 to get 960.
x=\frac{960}{64}
Divide both sides by 64.
x=15
Divide 960 by 64 to get 15.
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