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-5=12\left(x-1\right)-10\left(x+2\right)-5\left(2x+3\right)+12
Multiply both sides of the equation by 30, the least common multiple of 6,5,3.
-5=12x-12-10\left(x+2\right)-5\left(2x+3\right)+12
Use the distributive property to multiply 12 by x-1.
-5=12x-12-10x-20-5\left(2x+3\right)+12
Use the distributive property to multiply -10 by x+2.
-5=2x-12-20-5\left(2x+3\right)+12
Combine 12x and -10x to get 2x.
-5=2x-32-5\left(2x+3\right)+12
Subtract 20 from -12 to get -32.
-5=2x-32-10x-15+12
Use the distributive property to multiply -5 by 2x+3.
-5=-8x-32-15+12
Combine 2x and -10x to get -8x.
-5=-8x-47+12
Subtract 15 from -32 to get -47.
-5=-8x-35
Add -47 and 12 to get -35.
-8x-35=-5
Swap sides so that all variable terms are on the left hand side.
-8x=-5+35
Add 35 to both sides.
-8x=30
Add -5 and 35 to get 30.
x=\frac{30}{-8}
Divide both sides by -8.
x=-\frac{15}{4}
Reduce the fraction \frac{30}{-8} to lowest terms by extracting and canceling out 2.