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Simplifying 5r + -4 + (6z + -4) = 0 Reorder the terms: 5r + -4 + (-4 + 6z) = 0 Remove parenthesis around (-4 + 6z) 5r + -4 + -4 + 6z = 0 Reorder the terms: -4 + -4 + 5r + 6z = 0 Combine like terms: -4 + -4 = -8 -8 + 5r + 6z = 0 Solving -8 + 5r + 6z = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 5r + 8 + 6z = 0 + 8 Reorder the terms: -8 + 8 + 5r + 6z = 0 + 8 Combine like terms: -8 + 8 = 0 0 + 5r + 6z = 0 + 8 5r + 6z = 0 + 8 Combine like terms: 0 + 8 = 8 5r + 6z = 8 Add '-6z' to each side of the equation. 5r + 6z + -6z = 8 + -6z Combine like terms: 6z + -6z = 0 5r + 0 = 8 + -6z 5r = 8 + -6z Divide each side by '5'. r = 1.6 + -1.2z Simplifying r = 1.6 + -1.2z
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