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3x-mama
3x+2-tata
x+3x+2+3x=93
7x=93-2
7x=91/÷7
x=13
syn-13
mama-39
tata-41
spr.
13+39+41=93
y-tata
z-syn
x+y+z=93 (1)
1/3x=z
x+2=y
podstawiamy 2 ostanie równania do (1)
x+ x+2 +1/3x = 93
2 1/3x=91
x= 39 (mama)
tata zatem ma 41 lat
syn ma 13