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12-105x+15\left(\frac{x}{1}+\frac{1}{3}\right)=-75+30x
Multiply both sides of the equation by 30, the least common multiple of 5,2,3.
12-105x+15\left(x+\frac{1}{3}\right)=-75+30x
Anything divided by one gives itself.
12-105x+15x+15\times \frac{1}{3}=-75+30x
Use the distributive property to multiply 15 by x+\frac{1}{3}.
12-105x+15x+\frac{15}{3}=-75+30x
Multiply 15 and \frac{1}{3} to get \frac{15}{3}.
12-105x+15x+5=-75+30x
Divide 15 by 3 to get 5.
12-90x+5=-75+30x
Combine -105x and 15x to get -90x.
17-90x=-75+30x
Add 12 and 5 to get 17.
17-90x-30x=-75
Subtract 30x from both sides.
17-120x=-75
Combine -90x and -30x to get -120x.
-120x=-75-17
Subtract 17 from both sides.
-120x=-92
Subtract 17 from -75 to get -92.
x=\frac{-92}{-120}
Divide both sides by -120.
x=\frac{23}{30}
Reduce the fraction \frac{-92}{-120} to lowest terms by extracting and canceling out -4.