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-6-(-2) x a = 2
-6+2 x a =2
-4 x a = 2
a = 4 x 2
a = 8 czyli -6-(-2) x 8 = 2
5 - a +(-8) = 3
5 - a - 8 = 3
a = -5 + 8 + 3
a = 6 czyli 5 - 6 + (-8) = 3
6 x (-1) x a = 3
-6 x a = 3
a = 6 x 3
a = 18 czyli 6 x (-1) x 18 = 3
15 - a x 2 = 5
a = -15 x (-2) + 5
a = 30 + 5
a = 35 czyli 15 - 35 x 2 = 5
mam nadzieję że pomogłam :)