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Simplifying -1 = -7x + -7(-2x + -10) Reorder the terms: -1 = -7x + -7(-10 + -2x) -1 = -7x + (-10 * -7 + -2x * -7) -1 = -7x + (70 + 14x) Reorder the terms: -1 = 70 + -7x + 14x Combine like terms: -7x + 14x = 7x -1 = 70 + 7x Solving -1 = 70 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. -1 + -7x = 70 + 7x + -7x Combine like terms: 7x + -7x = 0 -1 + -7x = 70 + 0 -1 + -7x = 70 Add '1' to each side of the equation. -1 + 1 + -7x = 70 + 1 Combine like terms: -1 + 1 = 0 0 + -7x = 70 + 1 -7x = 70 + 1 Combine like terms: 70 + 1 = 71 -7x = 71 Divide each side by '-7'. x = -10.14285714 Simplifying x = -10.14285714
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