$$(35y3-7y2-9)-(-30y3+4y2-6y-8)$$
$6y-11y_{2}+65y_{3}-1$
$$35y_{3}-7y_{2}-9-\left(-30y_{3}\right)-4y_{2}-\left(-6y\right)-\left(-8\right)$$
$$35y_{3}-7y_{2}-9+30y_{3}-4y_{2}-\left(-6y\right)-\left(-8\right)$$
$$35y_{3}-7y_{2}-9+30y_{3}-4y_{2}+6y-\left(-8\right)$$
$$35y_{3}-7y_{2}-9+30y_{3}-4y_{2}+6y+8$$
$$65y_{3}-7y_{2}-9-4y_{2}+6y+8$$
$$65y_{3}-11y_{2}-9+6y+8$$
$$65y_{3}-11y_{2}-1+6y$$
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