Evaluate: 5(3z-6)=15

Expression: $5\left( 3z-6 \right)=15$

Divide both sides of the equation by $5$

$3z-6=3$

Move the constant to the right-hand side and change its sign

$3z=3+6$

Add the numbers

$3z=9$

Divide both sides of the equation by $3$

$z=3$

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