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3x - (4x - 5) = 12 - 6x
3x - 4x + 5 = 12 - 6x
-x = 7 /÷(-1)
x = -7
spr.
3 × (-7) - [4 × (-7) - 5] = 12 - 6 × (-7)
54 = 54
L = P
b)
4(2x + 3) + 5 = 3(2 - x) + 2
8x + 12 + 5 = 6 - 3x + 2
11x = -9 /÷11
x =
spr.
4[2 × (-9/11) + 3] + 5 = 3[2-(-9/11)] + 2
L = P
c)
x + 9 - x - 3 = 9 - x
x = 3
spr.
3 + 9 - 3 - 3 = 9 - 3
6 = 6
L = P
Liczę na naj, bo zwraca Ci się za to 15% punktów. :)