{8a+9b=36
{a-16b=210 /(-8)
{8a+9b=36
+ {-8a+128b=-1680
⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻
137b=-1644
b=-12
a-16b=210
a-16*(-12)=210
a+192=210
a=210-192
a=18
b=-12
a=18
spr.
8a+9b=36
8*18+9*(-12)=36
144-108=36
36=36
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