solve forx=
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= 4(5-x) + x(5-x)/ 2(7-x) + x(7-x) = 1
= 20-4x + 5x-x²/14-2x + 7x-x² = 1
= 20+x - x² / 14+5x-x² = 1
= 10 + x - x²/ 7 + 5x - x²= 1
= 10+ x - x² = 7 + 5x- x²
= 10-7= 5x-x -x²+x²
= 3= 4x
= x = 4/3
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