Solve for x
x = \frac{420}{19} = 22\frac{2}{19} \approx 22.105263158
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12x+7x=420
Multiply both sides of the equation by 420, the least common multiple of 35,60.
19x=420
Combine 12x and 7x to get 19x.
x=\frac{420}{19}
Divide both sides by 19.
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