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8x+3-6x=21
Subtract 6x from both sides.
2x+3=21
Combine 8x and -6x to get 2x.
2x=21-3
Subtract 3 from both sides.
2x=18
Subtract 3 from 21 to get 18.
x=\frac{18}{2}
Divide both sides by 2.
x=9
Divide 18 by 2 to get 9.