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Simplifying (4r + -7s) + -1(5r + -7s) = 0 Remove parenthesis around (4r + -7s) 4r + -7s + -1(5r + -7s) = 0 4r + -7s + (5r * -1 + -7s * -1) = 0 4r + -7s + (-5r + 7s) = 0 Reorder the terms: 4r + -5r + -7s + 7s = 0 Combine like terms: 4r + -5r = -1r -1r + -7s + 7s = 0 Combine like terms: -7s + 7s = 0 -1r + 0 = 0 -1r = 0 Solving -1r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by '-1'. r = 0 Simplifying r = 0
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