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