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Simplifying 2r + -9 + -3r = 4 Reorder the terms: -9 + 2r + -3r = 4 Combine like terms: 2r + -3r = -1r -9 + -1r = 4 Solving -9 + -1r = 4 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -1r = 4 + 9 Combine like terms: -9 + 9 = 0 0 + -1r = 4 + 9 -1r = 4 + 9 Combine like terms: 4 + 9 = 13 -1r = 13 Divide each side by '-1'. r = -13 Simplifying r = -13
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