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y=-4
-x=-6-2*(-4)
y=-4
-x=-6+8
y=-4
-x=2 /*(-1)
y=-4
x=-2
y=-4
b)
y-1=3(x+1)
x=1
y=3x+3+1
x=1
y=3*1+4
x=1
y=3+4
x=1
y=7
x=1