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x-2=5-2+y
y= 3-2-x
x-2= 5-2 +(3-2-x)
y=3-2-x
x-2=5-2+3-2-x
y=3-2-x
2x=6 /:2
y=3-2x
x=3
y=3-2*3
x=3
y=-3
x=3
b.3x-3y+4x=8
3x-15y=5-9y
7x=8+3y/:7