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Simplifying -90 + 13x = 99 + 4x Solving -90 + 13x = 99 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. -90 + 13x + -4x = 99 + 4x + -4x Combine like terms: 13x + -4x = 9x -90 + 9x = 99 + 4x + -4x Combine like terms: 4x + -4x = 0 -90 + 9x = 99 + 0 -90 + 9x = 99 Add '90' to each side of the equation. -90 + 90 + 9x = 99 + 90 Combine like terms: -90 + 90 = 0 0 + 9x = 99 + 90 9x = 99 + 90 Combine like terms: 99 + 90 = 189 9x = 189 Divide each side by '9'. x = 21 Simplifying x = 21
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