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Simplifying 3x + -1(4x + 5) = 3x + -21 Reorder the terms: 3x + -1(5 + 4x) = 3x + -21 3x + (5 * -1 + 4x * -1) = 3x + -21 3x + (-5 + -4x) = 3x + -21 Reorder the terms: -5 + 3x + -4x = 3x + -21 Combine like terms: 3x + -4x = -1x -5 + -1x = 3x + -21 Reorder the terms: -5 + -1x = -21 + 3x Solving -5 + -1x = -21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -5 + -1x + -3x = -21 + 3x + -3x Combine like terms: -1x + -3x = -4x -5 + -4x = -21 + 3x + -3x Combine like terms: 3x + -3x = 0 -5 + -4x = -21 + 0 -5 + -4x = -21 Add '5' to each side of the equation. -5 + 5 + -4x = -21 + 5 Combine like terms: -5 + 5 = 0 0 + -4x = -21 + 5 -4x = -21 + 5 Combine like terms: -21 + 5 = -16 -4x = -16 Divide each side by '-4'. x = 4 Simplifying x = 4
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