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3z\times 5+3\times 2=17z
Variable z cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 3z, the least common multiple of z,3.
15z+3\times 2=17z
Multiply 3 and 5 to get 15.
15z+6=17z
Multiply 3 and 2 to get 6.
15z+6-17z=0
Subtract 17z from both sides.
-2z+6=0
Combine 15z and -17z to get -2z.
-2z=-6
Subtract 6 from both sides. Anything subtracted from zero gives its negation.
z=\frac{-6}{-2}
Divide both sides by -2.
z=3
Divide -6 by -2 to get 3.