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9x-6=15+2x
Combine 16x and -7x to get 9x.
9x-6-2x=15
Subtract 2x from both sides.
7x-6=15
Combine 9x and -2x to get 7x.
7x=15+6
Add 6 to both sides.
7x=21
Add 15 and 6 to get 21.
x=\frac{21}{7}
Divide both sides by 7.
x=3
Divide 21 by 7 to get 3.