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