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Y = (7/9)*x-(31/3) // - (7/9)*x-(31/3)
Y-((7/9)*x)+31/3 = 0
Y+(-7/9)*x+31/3 = 0
Y-7/9*x+31/3 = 0 // - Y+31/3
-7/9*x = -(Y+31/3) // : -7/9
x = (-(Y+31/3))/(-7/9)
x = 9/7*(Y+31/3)
x = 9/7*(Y+31/3)
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