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Simplifying 100 = 7x + -2(6x + -20) Reorder the terms: 100 = 7x + -2(-20 + 6x) 100 = 7x + (-20 * -2 + 6x * -2) 100 = 7x + (40 + -12x) Reorder the terms: 100 = 40 + 7x + -12x Combine like terms: 7x + -12x = -5x 100 = 40 + -5x Solving 100 = 40 + -5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5x' to each side of the equation. 100 + 5x = 40 + -5x + 5x Combine like terms: -5x + 5x = 0 100 + 5x = 40 + 0 100 + 5x = 40 Add '-100' to each side of the equation. 100 + -100 + 5x = 40 + -100 Combine like terms: 100 + -100 = 0 0 + 5x = 40 + -100 5x = 40 + -100 Combine like terms: 40 + -100 = -60 5x = -60 Divide each side by '5'. x = -12 Simplifying x = -12
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