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Simplifying 84 = x + 3x Combine like terms: x + 3x = 4x 84 = 4x Solving 84 = 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 = 4x + -4x Combine like terms: 4x + -4x = 0 84 + -4x = 0 Add '-84' to each side of the equation. 84 + -84 + -4x = 0 + -84 Combine like terms: 84 + -84 = 0 0 + -4x = 0 + -84 -4x = 0 + -84 Combine like terms: 0 + -84 = -84 -4x = -84 Divide each side by '-4'. x = 21 Simplifying x = 21
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