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Simplifying 5 * 13.4 + 6y + 7z = 90 Multiply 5 * 13.4 67 + 6y + 7z = 90 Solving 67 + 6y + 7z = 90 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-67' to each side of the equation. 67 + 6y + -67 + 7z = 90 + -67 Reorder the terms: 67 + -67 + 6y + 7z = 90 + -67 Combine like terms: 67 + -67 = 0 0 + 6y + 7z = 90 + -67 6y + 7z = 90 + -67 Combine like terms: 90 + -67 = 23 6y + 7z = 23 Add '-7z' to each side of the equation. 6y + 7z + -7z = 23 + -7z Combine like terms: 7z + -7z = 0 6y + 0 = 23 + -7z 6y = 23 + -7z Divide each side by '6'. y = 3.833333333 + -1.166666667z Simplifying y = 3.833333333 + -1.166666667z
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