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20\left(x-1\right)+12\left(2x+1\right)=15\left(3x-1\right)
Multiply both sides of the equation by 60, the least common multiple of 3,5,4.
20x-20+12\left(2x+1\right)=15\left(3x-1\right)
Use the distributive property to multiply 20 by x-1.
20x-20+24x+12=15\left(3x-1\right)
Use the distributive property to multiply 12 by 2x+1.
44x-20+12=15\left(3x-1\right)
Combine 20x and 24x to get 44x.
44x-8=15\left(3x-1\right)
Add -20 and 12 to get -8.
44x-8=45x-15
Use the distributive property to multiply 15 by 3x-1.
44x-8-45x=-15
Subtract 45x from both sides.
-x-8=-15
Combine 44x and -45x to get -x.
-x=-15+8
Add 8 to both sides.
-x=-7
Add -15 and 8 to get -7.
x=7
Multiply both sides by -1.