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2x+3y=1
-9x-3y=6
2x+3y=1
-7x=7/-7
x= -1
2*(-1)+3y=1
3y=2+1
y=1
b) 3x-y=14
x-3y=-12 * (-3)
3x-y=14
-3x+9y=36
8y=50/8
y=6,25
x-3*6,25=-12
x=-12 -18,75
x=- 30,75