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Simplifying 3(5a + -4) + -1 = 77 Reorder the terms: 3(-4 + 5a) + -1 = 77 (-4 * 3 + 5a * 3) + -1 = 77 (-12 + 15a) + -1 = 77 Reorder the terms: -12 + -1 + 15a = 77 Combine like terms: -12 + -1 = -13 -13 + 15a = 77 Solving -13 + 15a = 77 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + 15a = 77 + 13 Combine like terms: -13 + 13 = 0 0 + 15a = 77 + 13 15a = 77 + 13 Combine like terms: 77 + 13 = 90 15a = 90 Divide each side by '15'. a = 6 Simplifying a = 6
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