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Simplifying 84 = 3(7 + -5x) 84 = (7 * 3 + -5x * 3) 84 = (21 + -15x) Solving 84 = 21 + -15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15x' to each side of the equation. 84 + 15x = 21 + -15x + 15x Combine like terms: -15x + 15x = 0 84 + 15x = 21 + 0 84 + 15x = 21 Add '-84' to each side of the equation. 84 + -84 + 15x = 21 + -84 Combine like terms: 84 + -84 = 0 0 + 15x = 21 + -84 15x = 21 + -84 Combine like terms: 21 + -84 = -63 15x = -63 Divide each side by '15'. x = -4.2 Simplifying x = -4.2
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