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Simplifying 3x + -1(90 + -1x) = 122 3x + (90 * -1 + -1x * -1) = 122 3x + (-90 + 1x) = 122 Reorder the terms: -90 + 3x + 1x = 122 Combine like terms: 3x + 1x = 4x -90 + 4x = 122 Solving -90 + 4x = 122 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '90' to each side of the equation. -90 + 90 + 4x = 122 + 90 Combine like terms: -90 + 90 = 0 0 + 4x = 122 + 90 4x = 122 + 90 Combine like terms: 122 + 90 = 212 4x = 212 Divide each side by '4'. x = 53 Simplifying x = 53
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