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6x+4x=3\times 3x+2\times 5x-72
Multiply both sides of the equation by 12, the least common multiple of 2,3,4,6.
10x=3\times 3x+2\times 5x-72
Combine 6x and 4x to get 10x.
10x=9x+10x-72
Multiply 3 and 3 to get 9. Multiply 2 and 5 to get 10.
10x=19x-72
Combine 9x and 10x to get 19x.
10x-19x=-72
Subtract 19x from both sides.
-9x=-72
Combine 10x and -19x to get -9x.
x=\frac{-72}{-9}
Divide both sides by -9.
x=8
Divide -72 by -9 to get 8.