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Simplifying 5(a + -7) + 4 = 3(a + -7) Reorder the terms: 5(-7 + a) + 4 = 3(a + -7) (-7 * 5 + a * 5) + 4 = 3(a + -7) (-35 + 5a) + 4 = 3(a + -7) Reorder the terms: -35 + 4 + 5a = 3(a + -7) Combine like terms: -35 + 4 = -31 -31 + 5a = 3(a + -7) Reorder the terms: -31 + 5a = 3(-7 + a) -31 + 5a = (-7 * 3 + a * 3) -31 + 5a = (-21 + 3a) Solving -31 + 5a = -21 + 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. -31 + 5a + -3a = -21 + 3a + -3a Combine like terms: 5a + -3a = 2a -31 + 2a = -21 + 3a + -3a Combine like terms: 3a + -3a = 0 -31 + 2a = -21 + 0 -31 + 2a = -21 Add '31' to each side of the equation. -31 + 31 + 2a = -21 + 31 Combine like terms: -31 + 31 = 0 0 + 2a = -21 + 31 2a = -21 + 31 Combine like terms: -21 + 31 = 10 2a = 10 Divide each side by '2'. a = 5 Simplifying a = 5
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