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(4/7)*x+3.8*y+2 = 0
4/7*x+3.8*y+2 = 0 // - 3.8*y+2
4/7*x = -(3.8*y+2) // : 4/7
x = (-(3.8*y+2))/4/7
x = -7/4*(3.8*y+2)
x = -7/4*(3.8*y+2)
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