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Simplifying (-2r) * 2x + y = 7 Remove parenthesis around (-2r) -2r * 2x + y = 7 Reorder the terms for easier multiplication: -2 * 2r * x + y = 7 Multiply -2 * 2 -4r * x + y = 7 Multiply r * x -4rx + y = 7 Solving -4rx + y = 7 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1y' to each side of the equation. -4rx + y + -1y = 7 + -1y Combine like terms: y + -1y = 0 -4rx + 0 = 7 + -1y -4rx = 7 + -1y Divide each side by '-4x'. r = -1.75x-1 + 0.25x-1y Simplifying r = -1.75x-1 + 0.25x-1y
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