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Simplifying 5(7x) + 4(5y) = 647 Remove parenthesis around (7x) 5 * 7x + 4(5y) = 647 Multiply 5 * 7 35x + 4(5y) = 647 Remove parenthesis around (5y) 35x + 4 * 5y = 647 Multiply 4 * 5 35x + 20y = 647 Solving 35x + 20y = 647 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20y' to each side of the equation. 35x + 20y + -20y = 647 + -20y Combine like terms: 20y + -20y = 0 35x + 0 = 647 + -20y 35x = 647 + -20y Divide each side by '35'. x = 18.48571429 + -0.5714285714y Simplifying x = 18.48571429 + -0.5714285714y
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