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Simplifying -3a + 7(-3 + 2a) = -98 -3a + (-3 * 7 + 2a * 7) = -98 -3a + (-21 + 14a) = -98 Reorder the terms: -21 + -3a + 14a = -98 Combine like terms: -3a + 14a = 11a -21 + 11a = -98 Solving -21 + 11a = -98 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 11a = -98 + 21 Combine like terms: -21 + 21 = 0 0 + 11a = -98 + 21 11a = -98 + 21 Combine like terms: -98 + 21 = -77 11a = -77 Divide each side by '11'. a = -7 Simplifying a = -7
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