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Simplifying 4 + -5(a + 5) = 2a Reorder the terms: 4 + -5(5 + a) = 2a 4 + (5 * -5 + a * -5) = 2a 4 + (-25 + -5a) = 2a Combine like terms: 4 + -25 = -21 -21 + -5a = 2a Solving -21 + -5a = 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. -21 + -5a + -2a = 2a + -2a Combine like terms: -5a + -2a = -7a -21 + -7a = 2a + -2a Combine like terms: 2a + -2a = 0 -21 + -7a = 0 Add '21' to each side of the equation. -21 + 21 + -7a = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -7a = 0 + 21 -7a = 0 + 21 Combine like terms: 0 + 21 = 21 -7a = 21 Divide each side by '-7'. a = -3 Simplifying a = -3
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