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Simplifying 0.07(10000x) + 0.05(10000y) = 640 Remove parenthesis around (10000x) 0.07 * 10000x + 0.05(10000y) = 640 Multiply 0.07 * 10000 700x + 0.05(10000y) = 640 Remove parenthesis around (10000y) 700x + 0.05 * 10000y = 640 Multiply 0.05 * 10000 700x + 500y = 640 Solving 700x + 500y = 640 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-500y' to each side of the equation. 700x + 500y + -500y = 640 + -500y Combine like terms: 500y + -500y = 0 700x + 0 = 640 + -500y 700x = 640 + -500y Divide each side by '700'. x = 0.9142857143 + -0.7142857143y Simplifying x = 0.9142857143 + -0.7142857143y
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