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Za x podstawiamy liczbę (-3)
L = 3 × (-3) - 2= -9 - 2 = -11
P = 5 × (-3) - 8 = -15 - 8 = -23
L ≠ P
Liczba (-3) nie spełnia równania.
2.
4x + 8 = 12 |-8
4x = 12 - 8
4x = 4 /:4
x = 1
3(-3)-2=5(-3)-8
-9-2=-15-8
-11=-23
2.
4x+8=12
4x=12-8
4x=4
x=1