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3÷b = 5÷(b+12)
Obliczenia:
3/b = 5/b + 12
3×(b+12)=5b
3b+36=5b /-3b
3b=26 /÷2
b=18
Sprawdzenie :
3÷18 = 5÷(18+12)
6=5÷30
6=6
3 ( b+12) = 5 x b
3b + 36 = 5b
3b - 5b = - 36
-2b = -36
b = 18
spr.
3 / 18 = 5 / 18 + 12
3 / 18 = 5 / 30
1/6 = 1/6
3×(b+12)=5b
3b+36=5b /-3b
3b=26 /÷2
b=18