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5\times 2x+15=3\times 7x+45
Multiply both sides of the equation by 15, the least common multiple of 3,5.
10x+15=3\times 7x+45
Multiply 5 and 2 to get 10.
10x+15=21x+45
Multiply 3 and 7 to get 21.
10x+15-21x=45
Subtract 21x from both sides.
-11x+15=45
Combine 10x and -21x to get -11x.
-11x=45-15
Subtract 15 from both sides.
-11x=30
Subtract 15 from 45 to get 30.
x=\frac{30}{-11}
Divide both sides by -11.
x=-\frac{30}{11}
Fraction \frac{30}{-11} can be rewritten as -\frac{30}{11} by extracting the negative sign.