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Simplifying 4 = -5(4x + 3) + 21x Reorder the terms: 4 = -5(3 + 4x) + 21x 4 = (3 * -5 + 4x * -5) + 21x 4 = (-15 + -20x) + 21x Combine like terms: -20x + 21x = 1x 4 = -15 + 1x Solving 4 = -15 + 1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 4 + -1x = -15 + 1x + -1x Combine like terms: 1x + -1x = 0 4 + -1x = -15 + 0 4 + -1x = -15 Add '-4' to each side of the equation. 4 + -4 + -1x = -15 + -4 Combine like terms: 4 + -4 = 0 0 + -1x = -15 + -4 -1x = -15 + -4 Combine like terms: -15 + -4 = -19 -1x = -19 Divide each side by '-1'. x = 19 Simplifying x = 19
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