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Simplifying 70 = (1 + -1x) * 100 + x * 20 Reorder the terms for easier multiplication: 70 = 100(1 + -1x) + x * 20 70 = (1 * 100 + -1x * 100) + x * 20 70 = (100 + -100x) + x * 20 Reorder the terms for easier multiplication: 70 = 100 + -100x + 20x Combine like terms: -100x + 20x = -80x 70 = 100 + -80x Solving 70 = 100 + -80x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '80x' to each side of the equation. 70 + 80x = 100 + -80x + 80x Combine like terms: -80x + 80x = 0 70 + 80x = 100 + 0 70 + 80x = 100 Add '-70' to each side of the equation. 70 + -70 + 80x = 100 + -70 Combine like terms: 70 + -70 = 0 0 + 80x = 100 + -70 80x = 100 + -70 Combine like terms: 100 + -70 = 30 80x = 30 Divide each side by '80'. x = 0.375 Simplifying x = 0.375
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