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18\times 2x+45=10\times 4x-72
Multiply both sides of the equation by 90, the least common multiple of 5,2,9.
36x+45=10\times 4x-72
Multiply 18 and 2 to get 36.
36x+45=40x-72
Multiply 10 and 4 to get 40.
36x+45-40x=-72
Subtract 40x from both sides.
-4x+45=-72
Combine 36x and -40x to get -4x.
-4x=-72-45
Subtract 45 from both sides.
-4x=-117
Subtract 45 from -72 to get -117.
x=\frac{-117}{-4}
Divide both sides by -4.
x=\frac{117}{4}
Fraction \frac{-117}{-4} can be simplified to \frac{117}{4} by removing the negative sign from both the numerator and the denominator.