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dla x=12
5x + 3 = 5*12 + 3 = 60 + 3 = 63
b) 3a - b + 5a + 2b - 6 = 8a + b - 6
dla a=2 i b=2
8a + b + 6 = 8 * 2 + 2 + 6 = 16 + 2 + 6 = 24
c) x + 2y - 3y - 3z + 5z - x = -y + 2z
dla x=5 y=8 z=6
-y+2z = -(8) + 2*6 = -8 + 12 = 4