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Simplifying 4(x + -21) = 16x Reorder the terms: 4(-21 + x) = 16x (-21 * 4 + x * 4) = 16x (-84 + 4x) = 16x Solving -84 + 4x = 16x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-16x' to each side of the equation. -84 + 4x + -16x = 16x + -16x Combine like terms: 4x + -16x = -12x -84 + -12x = 16x + -16x Combine like terms: 16x + -16x = 0 -84 + -12x = 0 Add '84' to each side of the equation. -84 + 84 + -12x = 0 + 84 Combine like terms: -84 + 84 = 0 0 + -12x = 0 + 84 -12x = 0 + 84 Combine like terms: 0 + 84 = 84 -12x = 84 Divide each side by '-12'. x = -7 Simplifying x = -7
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