Evaluate: -3x-3(5y-7x)-4y

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Expression: $-3x-3\left( 5y-7x \right)-4y$

Distribute $-3$ through the parentheses

$-3x-15y+21x-4y$

Collect like terms

$18x-15y-4y$

Collect like terms

$18x-19y$

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