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Simplifying 2z2 + -20rs + -15s2 = 0 Reorder the terms: -20rs + -15s2 + 2z2 = 0 Solving -20rs + -15s2 + 2z2 = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '15s2' to each side of the equation. -20rs + -15s2 + 15s2 + 2z2 = 0 + 15s2 Combine like terms: -15s2 + 15s2 = 0 -20rs + 0 + 2z2 = 0 + 15s2 -20rs + 2z2 = 0 + 15s2 Remove the zero: -20rs + 2z2 = 15s2 Add '-2z2' to each side of the equation. -20rs + 2z2 + -2z2 = 15s2 + -2z2 Combine like terms: 2z2 + -2z2 = 0 -20rs + 0 = 15s2 + -2z2 -20rs = 15s2 + -2z2 Divide each side by '-20s'. r = -0.75s + 0.1s-1z2 Simplifying r = -0.75s + 0.1s-1z2 Reorder the terms: r = 0.1s-1z2 + -0.75s
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