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Simplifying 84 = x + x + 5 + 2x + -1 Reorder the terms: 84 = 5 + -1 + x + x + 2x Combine like terms: 5 + -1 = 4 84 = 4 + x + x + 2x Combine like terms: x + x = 2x 84 = 4 + 2x + 2x Combine like terms: 2x + 2x = 4x 84 = 4 + 4x Solving 84 = 4 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 84 + -4x = 4 + 4x + -4x Combine like terms: 4x + -4x = 0 84 + -4x = 4 + 0 84 + -4x = 4 Add '-84' to each side of the equation. 84 + -84 + -4x = 4 + -84 Combine like terms: 84 + -84 = 0 0 + -4x = 4 + -84 -4x = 4 + -84 Combine like terms: 4 + -84 = -80 -4x = -80 Divide each side by '-4'. x = 20 Simplifying x = 20
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