Solve by cross multiplication method
20 - ( X - 1/2 ) - ( X - 2/3 ) - ( X - 3/4 ) = 0
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But the method of cross multiplication discussed below is ... (a1b2 – a2 b1) x + (b2c1 – b1c2) = 0 ... These values of x and y can also be written as ... 7x – 2y – 20 = 0
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