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3\left(x+6\right)=21-2\left(x-1\right)
Multiply both sides of the equation by 6, the least common multiple of 2,3.
3x+18=21-2\left(x-1\right)
Use the distributive property to multiply 3 by x+6.
3x+18=21-2x+2
Use the distributive property to multiply -2 by x-1.
3x+18=23-2x
Add 21 and 2 to get 23.
3x+18+2x=23
Add 2x to both sides.
5x+18=23
Combine 3x and 2x to get 5x.
5x=23-18
Subtract 18 from both sides.
5x=5
Subtract 18 from 23 to get 5.
x=\frac{5}{5}
Divide both sides by 5.
x=1
Divide 5 by 5 to get 1.