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1) 3*10 = 5x
x = 6
2) 4y = 6(y-3)
4y = 6y - 18
2y = 18
y = 9
3) 10 (z+1) = 20z
10z + 10 = 20z
10z = 10
z = 1
2. x - odległośc człowieka od punktu podparcia
5 * 5000 = 50 * x
x = 500