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2x+3y=7
y= -26+5x
2x+3(-26+5x)=7
y= -26+5x
2x-78+15x=7
y= -26+5x
17x=7+78
y= -26+5x
17x=85/:17
y= -26+5x
x=5
y= -26+5*5
x=5
y= -26+25
x=5
y= -1
x=5
2x+3y=7
3*(-26)-5x+2x-7=0
y=-26-5x
3*5x-26+2x-7=0
17x-85=0
17x=85
x=5
y=-26-5x
y=-26-5*5
y=-26-25
y=-1
x=5
y=-1