Factor completely. $$ 40 y z-30 y+28 z-21 $$

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Factor the expression $$ 40yz-30y+28z-21 $$.
Factor the expression by following steps:
- step0: Factor:
  $$40yz-30y+28z-21$$
- step1: Rewrite the expression:
  $$10y	imes 4z-10y	imes 3+7	imes 4z-7	imes 3$$
- step2: Factor the expression:
  $$10y\left(4z-3ight)+7\left(4z-3ight)$$
- step3: Factor the expression:
  $$\left(10y+7ight)\left(4z-3ight)$$
The factored form of the expression $$40yz-30y+28z-21$$ is $$(10y+7)(4z-3)$$.
The expression $$40yz-30y+28z-21$$ factors to $$(10y+7)(4z-3)$$.

Factor completely.

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