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Simplifying -15 = 7(4a + -3) Reorder the terms: -15 = 7(-3 + 4a) -15 = (-3 * 7 + 4a * 7) -15 = (-21 + 28a) Solving -15 = -21 + 28a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-28a' to each side of the equation. -15 + -28a = -21 + 28a + -28a Combine like terms: 28a + -28a = 0 -15 + -28a = -21 + 0 -15 + -28a = -21 Add '15' to each side of the equation. -15 + 15 + -28a = -21 + 15 Combine like terms: -15 + 15 = 0 0 + -28a = -21 + 15 -28a = -21 + 15 Combine like terms: -21 + 15 = -6 -28a = -6 Divide each side by '-28'. a = 0.2142857143 Simplifying a = 0.2142857143
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