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(4/3)*x-(5*y) = 7 // - 7
(4/3)*x-(5*y)-7 = 0
(4/3)*x-5*y-7 = 0
4/3*x-5*y-7 = 0 // + -5*y-7
4/3*x = -(-5*y-7) // : 4/3
x = (-(-5*y-7))/4/3
x = 3/4*(7-(-5*y))
x = 3/4*(7-(-5*y))
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