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×+y=18
20x=15+y
x=18-y
20(18-y)=15+y
360-20y=15+y
345=21y
y=345/21
y=16 i 3/7
x=18-16 i 3/7
x=17 i 7/7 - 16 i 3/7
x=1 i 4/7
x=1 i 4/7
y=16 i 3/7
[x+y=18
[20x-y=15
[x+y=18
--------------------
20x+x=15+18
21x=33
x=1 ⁴/₇
--------
x+y=18
1 ⁴/₇+y=18
y=18-1 ⁴/₇
y=16 ³/₇
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[x=1 ⁴/₇
[y=16 ³/₇