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6x+12=5\times 5x-45
Multiply both sides of the equation by 30, the least common multiple of 5,6,2.
6x+12=25x-45
Multiply 5 and 5 to get 25.
6x+12-25x=-45
Subtract 25x from both sides.
-19x+12=-45
Combine 6x and -25x to get -19x.
-19x=-45-12
Subtract 12 from both sides.
-19x=-57
Subtract 12 from -45 to get -57.
x=\frac{-57}{-19}
Divide both sides by -19.
x=3
Divide -57 by -19 to get 3.