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Simplifying 21 = 4x + -9 + -9 Reorder the terms: 21 = -9 + -9 + 4x Combine like terms: -9 + -9 = -18 21 = -18 + 4x Solving 21 = -18 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 21 + -4x = -18 + 4x + -4x Combine like terms: 4x + -4x = 0 21 + -4x = -18 + 0 21 + -4x = -18 Add '-21' to each side of the equation. 21 + -21 + -4x = -18 + -21 Combine like terms: 21 + -21 = 0 0 + -4x = -18 + -21 -4x = -18 + -21 Combine like terms: -18 + -21 = -39 -4x = -39 Divide each side by '-4'. x = 9.75 Simplifying x = 9.75
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