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y = 1/3x - 3/4
-y = 4 - 3x /*(-1)
y = 1/3x - 3/4
y = -4 + 3x
-4 + 3x = 1/3x -3/4
y = -4 + 3x
3x - 1/3x = -3/4 + 4
y = -4 + 3x
2 2/3x = 3 1/4
y = -4 + 3x
8/3x = 13/4 /:8/3
y = -4 + 3x
x = 13/4 * 3/8
y = -4 + 3x
x = 39/32
y = -4 + 3*39/32
x = 39/32
y = -4 + 117/32
x = 39/32
y = -128/32 +117/32
x = 39/32
y = -11/32
x = 39/32 = 1 7/32