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Simplifying (5x + -1) + -1(4x) = 90 Reorder the terms: (-1 + 5x) + -1(4x) = 90 Remove parenthesis around (-1 + 5x) -1 + 5x + -1(4x) = 90 Remove parenthesis around (4x) -1 + 5x + -1 * 4x = 90 Multiply -1 * 4 -1 + 5x + -4x = 90 Combine like terms: 5x + -4x = 1x -1 + 1x = 90 Solving -1 + 1x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 1x = 90 + 1 Combine like terms: -1 + 1 = 0 0 + 1x = 90 + 1 1x = 90 + 1 Combine like terms: 90 + 1 = 91 1x = 91 Divide each side by '1'. x = 91 Simplifying x = 91
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