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3x+21=2x+14
Use the distributive property to multiply x+7 by 3.
3x+21-2x=14
Subtract 2x from both sides.
x+21=14
Combine 3x and -2x to get x.
x=14-21
Subtract 21 from both sides.
x=-7
Subtract 21 from 14 to get -7.