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Simplifying 5(4x + y) + 7z = -19 (4x * 5 + y * 5) + 7z = -19 (20x + 5y) + 7z = -19 Solving 20x + 5y + 7z = -19 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5y' to each side of the equation. 20x + 5y + -5y + 7z = -19 + -5y Combine like terms: 5y + -5y = 0 20x + 0 + 7z = -19 + -5y 20x + 7z = -19 + -5y Add '-7z' to each side of the equation. 20x + 7z + -7z = -19 + -5y + -7z Combine like terms: 7z + -7z = 0 20x + 0 = -19 + -5y + -7z 20x = -19 + -5y + -7z Divide each side by '20'. x = -0.95 + -0.25y + -0.35z Simplifying x = -0.95 + -0.25y + -0.35z
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