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a+(2-1)b=19
a+1b = 19
* a+4b= 31
# a+1b=19 - a+4b=31
-3b= -12
b= -12/3
=-4
# a+1b=19 ⇒ a+1.-4=19
a+(-4)=19
a= 19+4
= 23