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12x + 180 - 18x = 132 -- wymnożyliśmy zawartość nawiasu
(-6x) + 180 = 132 / -180
(-6x) = 132 - 180
(-6x) = (-48) /*(-1)
6x = 48
x = 8
12x + 180 - 18x = 132 (redukcja wyrazów podobnych)
- 6x = - 48/ :(-6)
x= 8