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Simplifying 7a + -18 = -3(-3a + 3) + 7a Reorder the terms: -18 + 7a = -3(-3a + 3) + 7a Reorder the terms: -18 + 7a = -3(3 + -3a) + 7a -18 + 7a = (3 * -3 + -3a * -3) + 7a -18 + 7a = (-9 + 9a) + 7a Combine like terms: 9a + 7a = 16a -18 + 7a = -9 + 16a Solving -18 + 7a = -9 + 16a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-16a' to each side of the equation. -18 + 7a + -16a = -9 + 16a + -16a Combine like terms: 7a + -16a = -9a -18 + -9a = -9 + 16a + -16a Combine like terms: 16a + -16a = 0 -18 + -9a = -9 + 0 -18 + -9a = -9 Add '18' to each side of the equation. -18 + 18 + -9a = -9 + 18 Combine like terms: -18 + 18 = 0 0 + -9a = -9 + 18 -9a = -9 + 18 Combine like terms: -9 + 18 = 9 -9a = 9 Divide each side by '-9'. a = -1 Simplifying a = -1
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