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2\left(x+2\right)-3\left(2x+4\right)=3x+7-12x
Multiply both sides of the equation by 6, the least common multiple of 3,2,6.
2x+4-3\left(2x+4\right)=3x+7-12x
Use the distributive property to multiply 2 by x+2.
2x+4-6x-12=3x+7-12x
Use the distributive property to multiply -3 by 2x+4.
-4x+4-12=3x+7-12x
Combine 2x and -6x to get -4x.
-4x-8=3x+7-12x
Subtract 12 from 4 to get -8.
-4x-8=-9x+7
Combine 3x and -12x to get -9x.
-4x-8+9x=7
Add 9x to both sides.
5x-8=7
Combine -4x and 9x to get 5x.
5x=7+8
Add 8 to both sides.
5x=15
Add 7 and 8 to get 15.
x=\frac{15}{5}
Divide both sides by 5.
x=3
Divide 15 by 5 to get 3.