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Simplifying 5x + -1(4x + 9) = 5x + -21 Reorder the terms: 5x + -1(9 + 4x) = 5x + -21 5x + (9 * -1 + 4x * -1) = 5x + -21 5x + (-9 + -4x) = 5x + -21 Reorder the terms: -9 + 5x + -4x = 5x + -21 Combine like terms: 5x + -4x = 1x -9 + 1x = 5x + -21 Reorder the terms: -9 + 1x = -21 + 5x Solving -9 + 1x = -21 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. -9 + 1x + -5x = -21 + 5x + -5x Combine like terms: 1x + -5x = -4x -9 + -4x = -21 + 5x + -5x Combine like terms: 5x + -5x = 0 -9 + -4x = -21 + 0 -9 + -4x = -21 Add '9' to each side of the equation. -9 + 9 + -4x = -21 + 9 Combine like terms: -9 + 9 = 0 0 + -4x = -21 + 9 -4x = -21 + 9 Combine like terms: -21 + 9 = -12 -4x = -12 Divide each side by '-4'. x = 3 Simplifying x = 3
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