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Simplifying -1a + 7 = 3(1 + 3a) + 4 Reorder the terms: 7 + -1a = 3(1 + 3a) + 4 7 + -1a = (1 * 3 + 3a * 3) + 4 7 + -1a = (3 + 9a) + 4 Reorder the terms: 7 + -1a = 3 + 4 + 9a Combine like terms: 3 + 4 = 7 7 + -1a = 7 + 9a Add '-7' to each side of the equation. 7 + -7 + -1a = 7 + -7 + 9a Combine like terms: 7 + -7 = 0 0 + -1a = 7 + -7 + 9a -1a = 7 + -7 + 9a Combine like terms: 7 + -7 = 0 -1a = 0 + 9a -1a = 9a Solving -1a = 9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9a' to each side of the equation. -1a + -9a = 9a + -9a Combine like terms: -1a + -9a = -10a -10a = 9a + -9a Combine like terms: 9a + -9a = 0 -10a = 0 Divide each side by '-10'. a = 0.0 Simplifying a = 0.0
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