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a₂-a₁=a₃-a₂
a)
(x+1)/3 - (x-2) = 5x - (x+1)/3 ==========>*3 pozbywasz się ułamka
x+1 -3(x-2) = 15x -x -1
x+1 -3x+6 = 14x-1
-16x = -8
x = 0,5
b)
3x+16 = x²+16
x²-3x=0
x(x-3) =0
x=0 V x=3