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15x+3=15x+3+x
Multiply both sides of the equation by 3.
15x+3=16x+3
Combine 15x and x to get 16x.
15x+3-16x=3
Subtract 16x from both sides.
-x+3=3
Combine 15x and -16x to get -x.
-x=3-3
Subtract 3 from both sides.
-x=0
Subtract 3 from 3 to get 0.
x=0
Product of two numbers is equal to 0 if at least one of them is 0. Since -1 is not equal to 0, x must be equal to 0.