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7\left(2x+3\right)-9\left(3x-1\right)=42\left(7x-8\right)
Multiply both sides of the equation by 126, the least common multiple of 18,14,3.
14x+21-9\left(3x-1\right)=42\left(7x-8\right)
Use the distributive property to multiply 7 by 2x+3.
14x+21-27x+9=42\left(7x-8\right)
Use the distributive property to multiply -9 by 3x-1.
-13x+21+9=42\left(7x-8\right)
Combine 14x and -27x to get -13x.
-13x+30=42\left(7x-8\right)
Add 21 and 9 to get 30.
-13x+30=294x-336
Use the distributive property to multiply 42 by 7x-8.
-13x+30-294x=-336
Subtract 294x from both sides.
-307x+30=-336
Combine -13x and -294x to get -307x.
-307x=-336-30
Subtract 30 from both sides.
-307x=-366
Subtract 30 from -336 to get -366.
x=\frac{-366}{-307}
Divide both sides by -307.
x=\frac{366}{307}
Fraction \frac{-366}{-307} can be simplified to \frac{366}{307} by removing the negative sign from both the numerator and the denominator.