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Simplifying -7(-1x + 4) = 90 + -7x Reorder the terms: -7(4 + -1x) = 90 + -7x (4 * -7 + -1x * -7) = 90 + -7x (-28 + 7x) = 90 + -7x Solving -28 + 7x = 90 + -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. -28 + 7x + 7x = 90 + -7x + 7x Combine like terms: 7x + 7x = 14x -28 + 14x = 90 + -7x + 7x Combine like terms: -7x + 7x = 0 -28 + 14x = 90 + 0 -28 + 14x = 90 Add '28' to each side of the equation. -28 + 28 + 14x = 90 + 28 Combine like terms: -28 + 28 = 0 0 + 14x = 90 + 28 14x = 90 + 28 Combine like terms: 90 + 28 = 118 14x = 118 Divide each side by '14'. x = 8.428571429 Simplifying x = 8.428571429
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