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Simplifying -3 + 3a = 7(-4 + 4a) -3 + 3a = (-4 * 7 + 4a * 7) -3 + 3a = (-28 + 28a) Solving -3 + 3a = -28 + 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. -3 + 3a + -28a = -28 + 28a + -28a Combine like terms: 3a + -28a = -25a -3 + -25a = -28 + 28a + -28a Combine like terms: 28a + -28a = 0 -3 + -25a = -28 + 0 -3 + -25a = -28 Add '3' to each side of the equation. -3 + 3 + -25a = -28 + 3 Combine like terms: -3 + 3 = 0 0 + -25a = -28 + 3 -25a = -28 + 3 Combine like terms: -28 + 3 = -25 -25a = -25 Divide each side by '-25'. a = 1 Simplifying a = 1
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