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Simplifying (-4)(-4) + -21 = x Multiply -4 * -4 16 + -21 = x Combine like terms: 16 + -21 = -5 -5 = x Solving -5 = x 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. -5 + -1x = x + -1x Combine like terms: x + -1x = 0 -5 + -1x = 0 Add '5' to each side of the equation. -5 + 5 + -1x = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1x = 0 + 5 -1x = 0 + 5 Combine like terms: 0 + 5 = 5 -1x = 5 Divide each side by '-1'. x = -5 Simplifying x = -5
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