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Simplifying 5(4x + y) + 3z = -7 (4x * 5 + y * 5) + 3z = -7 (20x + 5y) + 3z = -7 Solving 20x + 5y + 3z = -7 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 + 3z = -7 + -5y Combine like terms: 5y + -5y = 0 20x + 0 + 3z = -7 + -5y 20x + 3z = -7 + -5y Add '-3z' to each side of the equation. 20x + 3z + -3z = -7 + -5y + -3z Combine like terms: 3z + -3z = 0 20x + 0 = -7 + -5y + -3z 20x = -7 + -5y + -3z Divide each side by '20'. x = -0.35 + -0.25y + -0.15z Simplifying x = -0.35 + -0.25y + -0.15z
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