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3\left(x-7\right)-12=-4\left(5x+8\right)
Multiply both sides of the equation by 12, the least common multiple of 4,3.
3x-21-12=-4\left(5x+8\right)
Use the distributive property to multiply 3 by x-7.
3x-33=-4\left(5x+8\right)
Subtract 12 from -21 to get -33.
3x-33=-20x-32
Use the distributive property to multiply -4 by 5x+8.
3x-33+20x=-32
Add 20x to both sides.
23x-33=-32
Combine 3x and 20x to get 23x.
23x=-32+33
Add 33 to both sides.
23x=1
Add -32 and 33 to get 1.
x=\frac{1}{23}
Divide both sides by 23.