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Simplifying -0.84(a + 4) = -4.2 Reorder the terms: -0.84(4 + a) = -4.2 (4 * -0.84 + a * -0.84) = -4.2 (-3.36 + -0.84a) = -4.2 Solving -3.36 + -0.84a = -4.2 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3.36' to each side of the equation. -3.36 + 3.36 + -0.84a = -4.2 + 3.36 Combine like terms: -3.36 + 3.36 = 0.00 0.00 + -0.84a = -4.2 + 3.36 -0.84a = -4.2 + 3.36 Combine like terms: -4.2 + 3.36 = -0.84 -0.84a = -0.84 Divide each side by '-0.84'. a = 1 Simplifying a = 1
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