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12x-20+3\left(4x-7\right)=10x-13
Use the distributive property to multiply 4 by 3x-5.
12x-20+12x-21=10x-13
Use the distributive property to multiply 3 by 4x-7.
24x-20-21=10x-13
Combine 12x and 12x to get 24x.
24x-41=10x-13
Subtract 21 from -20 to get -41.
24x-41-10x=-13
Subtract 10x from both sides.
14x-41=-13
Combine 24x and -10x to get 14x.
14x=-13+41
Add 41 to both sides.
14x=28
Add -13 and 41 to get 28.
x=\frac{28}{14}
Divide both sides by 14.
x=2
Divide 28 by 14 to get 2.