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Simplifying 20 + -1(2x + 4y) = 0 20 + (2x * -1 + 4y * -1) = 0 20 + (-2x + -4y) = 0 Solving 20 + -2x + -4y = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -2x + -20 + -4y = 0 + -20 Reorder the terms: 20 + -20 + -2x + -4y = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -2x + -4y = 0 + -20 -2x + -4y = 0 + -20 Combine like terms: 0 + -20 = -20 -2x + -4y = -20 Add '4y' to each side of the equation. -2x + -4y + 4y = -20 + 4y Combine like terms: -4y + 4y = 0 -2x + 0 = -20 + 4y -2x = -20 + 4y Divide each side by '-2'. x = 10 + -2y Simplifying x = 10 + -2y
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