8x-20-5y+10=0 x=2+2y x=2+2×54/99
x-2y=2 8(2+2y)-20+10=5y x=2+1 1/11
16+16y-20+10=5y x=3 1/11
16y-5y= -16+20-10
11y= -6
y= -6÷11
y=54/99
x=3 1/11
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8x-20-5y+10=0 x=2+2y x=2+2×54/99
x-2y=2 8(2+2y)-20+10=5y x=2+1 1/11
16+16y-20+10=5y x=3 1/11
16y-5y= -16+20-10
11y= -6
y= -6÷11
y=54/99
x=3 1/11