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30\times \frac{14}{\frac{1}{2}}-6\times 2\left(x+3\right)=15\times 3x-10\times 2\left(x-7\right)
Multiply both sides of the equation by 30, the least common multiple of 5,2,3.
30\times 14\times 2-6\times 2\left(x+3\right)=15\times 3x-10\times 2\left(x-7\right)
Divide 14 by \frac{1}{2} by multiplying 14 by the reciprocal of \frac{1}{2}.
30\times 28-6\times 2\left(x+3\right)=15\times 3x-10\times 2\left(x-7\right)
Multiply 14 and 2 to get 28.
840-6\times 2\left(x+3\right)=15\times 3x-10\times 2\left(x-7\right)
Multiply 30 and 28 to get 840.
840-12\left(x+3\right)=15\times 3x-10\times 2\left(x-7\right)
Multiply -6 and 2 to get -12.
840-12x-36=15\times 3x-10\times 2\left(x-7\right)
Use the distributive property to multiply -12 by x+3.
804-12x=15\times 3x-10\times 2\left(x-7\right)
Subtract 36 from 840 to get 804.
804-12x=45x-20\left(x-7\right)
Multiply 15 and 3 to get 45. Multiply -10 and 2 to get -20.
804-12x=45x-20x+140
Use the distributive property to multiply -20 by x-7.
804-12x=25x+140
Combine 45x and -20x to get 25x.
804-12x-25x=140
Subtract 25x from both sides.
804-37x=140
Combine -12x and -25x to get -37x.
-37x=140-804
Subtract 804 from both sides.
-37x=-664
Subtract 804 from 140 to get -664.
x=\frac{-664}{-37}
Divide both sides by -37.
x=\frac{664}{37}
Fraction \frac{-664}{-37} can be simplified to \frac{664}{37} by removing the negative sign from both the numerator and the denominator.