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y+x=7
1/3x+3+x=7
4/3x=4 /:4/3
x=3
y=4
b)y=-2x+2
4y+3x=-12
-8x+8+3x=-12
-5x=-20 /:-5
x=4
y=-6
c)y-3x+4=0
4=x
y-12+4=0
y=8
x=4