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3\times 5+x-1=15x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 3x, the least common multiple of x,3x.
15+x-1=15x
Multiply 3 and 5 to get 15.
14+x=15x
Subtract 1 from 15 to get 14.
14+x-15x=0
Subtract 15x from both sides.
14-14x=0
Combine x and -15x to get -14x.
-14x=-14
Subtract 14 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-14}{-14}
Divide both sides by -14.
x=1
Divide -14 by -14 to get 1.