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Simplifying 0 = x2 + rx + -2x + 4 Reorder the terms: 0 = 4 + rx + -2x + x2 Solving 0 = 4 + rx + -2x + x2 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1rx' to each side of the equation. 0 + -1rx = 4 + rx + -2x + -1rx + x2 Remove the zero: -1rx = 4 + rx + -2x + -1rx + x2 Reorder the terms: -1rx = 4 + rx + -1rx + -2x + x2 Combine like terms: rx + -1rx = 0 -1rx = 4 + 0 + -2x + x2 -1rx = 4 + -2x + x2 Divide each side by '-1x'. r = -4x-1 + 2 + -1x Simplifying r = -4x-1 + 2 + -1x Reorder the terms: r = 2 + -4x-1 + -1x
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