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3y + 18 - y = 2y + 18
2y - 2y = 18 - 18
0 = 0
równanie ma nieskończenie wiele rozwiązań
(x-7)-2(3x+5)=3
x - 7 - 6x - 10 = 3
-5x = 3 + 17
-5x = 20 /:(-5)
x = -4