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Simplifying 4(-5x + -4) + 5x + 4 = -87 Reorder the terms: 4(-4 + -5x) + 5x + 4 = -87 (-4 * 4 + -5x * 4) + 5x + 4 = -87 (-16 + -20x) + 5x + 4 = -87 Reorder the terms: -16 + 4 + -20x + 5x = -87 Combine like terms: -16 + 4 = -12 -12 + -20x + 5x = -87 Combine like terms: -20x + 5x = -15x -12 + -15x = -87 Solving -12 + -15x = -87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -15x = -87 + 12 Combine like terms: -12 + 12 = 0 0 + -15x = -87 + 12 -15x = -87 + 12 Combine like terms: -87 + 12 = -75 -15x = -75 Divide each side by '-15'. x = 5 Simplifying x = 5
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