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Simplifying 4a + -16 = 21a Reorder the terms: -16 + 4a = 21a Solving -16 + 4a = 21a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21a' to each side of the equation. -16 + 4a + -21a = 21a + -21a Combine like terms: 4a + -21a = -17a -16 + -17a = 21a + -21a Combine like terms: 21a + -21a = 0 -16 + -17a = 0 Add '16' to each side of the equation. -16 + 16 + -17a = 0 + 16 Combine like terms: -16 + 16 = 0 0 + -17a = 0 + 16 -17a = 0 + 16 Combine like terms: 0 + 16 = 16 -17a = 16 Divide each side by '-17'. a = -0.9411764706 Simplifying a = -0.9411764706
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