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Simplifying 20 + -7x = 84 + -15x Solving 20 + -7x = 84 + -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. 20 + -7x + 15x = 84 + -15x + 15x Combine like terms: -7x + 15x = 8x 20 + 8x = 84 + -15x + 15x Combine like terms: -15x + 15x = 0 20 + 8x = 84 + 0 20 + 8x = 84 Add '-20' to each side of the equation. 20 + -20 + 8x = 84 + -20 Combine like terms: 20 + -20 = 0 0 + 8x = 84 + -20 8x = 84 + -20 Combine like terms: 84 + -20 = 64 8x = 64 Divide each side by '8'. x = 8 Simplifying x = 8
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