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Simplifying 10(a + -2) + -1 = 4 Reorder the terms: 10(-2 + a) + -1 = 4 (-2 * 10 + a * 10) + -1 = 4 (-20 + 10a) + -1 = 4 Reorder the terms: -20 + -1 + 10a = 4 Combine like terms: -20 + -1 = -21 -21 + 10a = 4 Solving -21 + 10a = 4 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 10a = 4 + 21 Combine like terms: -21 + 21 = 0 0 + 10a = 4 + 21 10a = 4 + 21 Combine like terms: 4 + 21 = 25 10a = 25 Divide each side by '10'. a = 2.5 Simplifying a = 2.5
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