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3x+7=22
Combine 5x and -2x to get 3x.
3x=22-7
Subtract 7 from both sides.
3x=15
Subtract 7 from 22 to get 15.
x=\frac{15}{3}
Divide both sides by 3.
x=5
Divide 15 by 3 to get 5.