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2\times 2x+756=21\left(x-18\right)
Multiply both sides of the equation by 14, the least common multiple of 7,2.
4x+756=21\left(x-18\right)
Multiply 2 and 2 to get 4.
4x+756=21x-378
Use the distributive property to multiply 21 by x-18.
4x+756-21x=-378
Subtract 21x from both sides.
-17x+756=-378
Combine 4x and -21x to get -17x.
-17x=-378-756
Subtract 756 from both sides.
-17x=-1134
Subtract 756 from -378 to get -1134.
x=\frac{-1134}{-17}
Divide both sides by -17.
x=\frac{1134}{17}
Fraction \frac{-1134}{-17} can be simplified to \frac{1134}{17} by removing the negative sign from both the numerator and the denominator.