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7+x=4-2x
Multiply both sides of the equation by 2.
7+x+2x=4
Add 2x to both sides.
7+3x=4
Combine x and 2x to get 3x.
3x=4-7
Subtract 7 from both sides.
3x=-3
Subtract 7 from 4 to get -3.
x=\frac{-3}{3}
Divide both sides by 3.
x=-1
Divide -3 by 3 to get -1.