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4x+3y = -1
y = 3-2x
4x +3(3-2x) = -1
y = 3-2x
4x+9-6x = -1
y = 3-2x
-2x = -1-9
y = 3-2x
-2x = -10 /:(-2)
y = 3-2x
x = 5
y = 3 -2*5
x = 5
y = 3-10
x = 5
y = -7
x = 5