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2x-\left(x-2\right)=3x+18
Multiply both sides of the equation by 6, the least common multiple of 3,6,2.
2x-x-\left(-2\right)=3x+18
To find the opposite of x-2, find the opposite of each term.
2x-x+2=3x+18
The opposite of -2 is 2.
x+2=3x+18
Combine 2x and -x to get x.
x+2-3x=18
Subtract 3x from both sides.
-2x+2=18
Combine x and -3x to get -2x.
-2x=18-2
Subtract 2 from both sides.
-2x=16
Subtract 2 from 18 to get 16.
x=\frac{16}{-2}
Divide both sides by -2.
x=-8
Divide 16 by -2 to get -8.