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5\times 2x-3\left(2x+4\right)=3\times 2x
Multiply both sides of the equation by 15, the least common multiple of 3,5.
10x-3\left(2x+4\right)=3\times 2x
Multiply 5 and 2 to get 10.
10x-6x-12=3\times 2x
Use the distributive property to multiply -3 by 2x+4.
4x-12=3\times 2x
Combine 10x and -6x to get 4x.
4x-12=6x
Multiply 3 and 2 to get 6.
4x-12-6x=0
Subtract 6x from both sides.
-2x-12=0
Combine 4x and -6x to get -2x.
-2x=12
Add 12 to both sides. Anything plus zero gives itself.
x=\frac{12}{-2}
Divide both sides by -2.
x=-6
Divide 12 by -2 to get -6.