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Simplifying 4x + -1 = 90 + -9x Reorder the terms: -1 + 4x = 90 + -9x Solving -1 + 4x = 90 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. -1 + 4x + 9x = 90 + -9x + 9x Combine like terms: 4x + 9x = 13x -1 + 13x = 90 + -9x + 9x Combine like terms: -9x + 9x = 0 -1 + 13x = 90 + 0 -1 + 13x = 90 Add '1' to each side of the equation. -1 + 1 + 13x = 90 + 1 Combine like terms: -1 + 1 = 0 0 + 13x = 90 + 1 13x = 90 + 1 Combine like terms: 90 + 1 = 91 13x = 91 Divide each side by '13'. x = 7 Simplifying x = 7
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