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Simplifying 3r + s + s + 7 = 0 Reorder the terms: 7 + 3r + s + s = 0 Combine like terms: s + s = 2s 7 + 3r + 2s = 0 Solving 7 + 3r + 2s = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + 3r + -7 + 2s = 0 + -7 Reorder the terms: 7 + -7 + 3r + 2s = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 3r + 2s = 0 + -7 3r + 2s = 0 + -7 Combine like terms: 0 + -7 = -7 3r + 2s = -7 Add '-2s' to each side of the equation. 3r + 2s + -2s = -7 + -2s Combine like terms: 2s + -2s = 0 3r + 0 = -7 + -2s 3r = -7 + -2s Divide each side by '3'. r = -2.333333333 + -0.6666666667s Simplifying r = -2.333333333 + -0.6666666667s
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