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P/ ab= x
S = a/bx / *bx
Sbx=a / : SB
x= a/sb
y = 2t - 3x / -2t
y - 2t= -3x / :-3
y - 2y/ -3= x
y = x-1/2 / + 1/2
y+ 1/2= x
abx=p /:ab
x=p/ab
S=a/bx /*x
S*x=a/b /:s
x=a/bs
y=2t-3x
2t-3x=y /:2t
-3x=y/2t /:(-3)
x=y/2t*(-3)
x=y/-6t
y=x-1/2
x-1/2=y /*(-2)
x=-2y
abx=P//ab
x=P:ab
b)S=a/bx /*x
S*x=a/b /:s
x=a/bs
c)y=2t-3x
2t-3x=y
-3x=y-2t//(-3)
d)y=x-1:2/2
2y=2x-2
2x=2y+2//2