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20-3+12x=4\left(3\times 3+1\right)+15
Multiply both sides of the equation by 12, the least common multiple of 3,4.
17+12x=4\left(3\times 3+1\right)+15
Subtract 3 from 20 to get 17.
17+12x=4\left(9+1\right)+15
Multiply 3 and 3 to get 9.
17+12x=4\times 10+15
Add 9 and 1 to get 10.
17+12x=40+15
Multiply 4 and 10 to get 40.
17+12x=55
Add 40 and 15 to get 55.
12x=55-17
Subtract 17 from both sides.
12x=38
Subtract 17 from 55 to get 38.
x=\frac{38}{12}
Divide both sides by 12.
x=\frac{19}{6}
Reduce the fraction \frac{38}{12} to lowest terms by extracting and canceling out 2.