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Simplifying 3a + -3(7 + 5a) = 9(2 + 9) 3a + (7 * -3 + 5a * -3) = 9(2 + 9) 3a + (-21 + -15a) = 9(2 + 9) Reorder the terms: -21 + 3a + -15a = 9(2 + 9) Combine like terms: 3a + -15a = -12a -21 + -12a = 9(2 + 9) Combine like terms: 2 + 9 = 11 -21 + -12a = 9(11) Multiply 9 * 11 -21 + -12a = 99 Solving -21 + -12a = 99 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 + -12a = 99 + 21 Combine like terms: -21 + 21 = 0 0 + -12a = 99 + 21 -12a = 99 + 21 Combine like terms: 99 + 21 = 120 -12a = 120 Divide each side by '-12'. a = -10 Simplifying a = -10
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