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15x+12\left(2x-14\right)+7\times 12=15\left(2x-14\right)+12x
Multiply both sides of the equation by 420, the least common multiple of 28,35,60.
15x+24x-168+7\times 12=15\left(2x-14\right)+12x
Use the distributive property to multiply 12 by 2x-14.
39x-168+7\times 12=15\left(2x-14\right)+12x
Combine 15x and 24x to get 39x.
39x-168+84=15\left(2x-14\right)+12x
Multiply 7 and 12 to get 84.
39x-84=15\left(2x-14\right)+12x
Add -168 and 84 to get -84.
39x-84=30x-210+12x
Use the distributive property to multiply 15 by 2x-14.
39x-84=42x-210
Combine 30x and 12x to get 42x.
39x-84-42x=-210
Subtract 42x from both sides.
-3x-84=-210
Combine 39x and -42x to get -3x.
-3x=-210+84
Add 84 to both sides.
-3x=-126
Add -210 and 84 to get -126.
x=\frac{-126}{-3}
Divide both sides by -3.
x=42
Divide -126 by -3 to get 42.