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7 = x
Dla argumentu 7
b) 5 = 5x + 10 / -10
5 - 10 = 5x
5x = -5
x = -1
Dla argumentu -1
c) 5 = 0,2x - 1 / +1
6 = 0,2x / · 5
x = 30
Dla argumentu 30
d) 5 = 1/3x - 2/3 / + 2/3
5 2/3 = 1/3x
17/3 = 1/3x / · 3
x = 17
Dla argumentu 17