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20\left(1-2x\right)+15\left(2-3x\right)+12x=5
Multiply both sides of the equation by 60, the least common multiple of 3,4,5,12.
20-40x+15\left(2-3x\right)+12x=5
Use the distributive property to multiply 20 by 1-2x.
20-40x+30-45x+12x=5
Use the distributive property to multiply 15 by 2-3x.
50-40x-45x+12x=5
Add 20 and 30 to get 50.
50-85x+12x=5
Combine -40x and -45x to get -85x.
50-73x=5
Combine -85x and 12x to get -73x.
-73x=5-50
Subtract 50 from both sides.
-73x=-45
Subtract 50 from 5 to get -45.
x=\frac{-45}{-73}
Divide both sides by -73.
x=\frac{45}{73}
Fraction \frac{-45}{-73} can be simplified to \frac{45}{73} by removing the negative sign from both the numerator and the denominator.