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1.
3x+5=26
3x = 26 - 5
3x = 21
x = 7
2.
2y-6+3y+24 = 5y + 18
3.
5x+7+2x-21 = 7x - 14
4.
3x-6=10-x
3x + x = 10 + 6
4x = 16
x = 4
5.
4x+4-2x= -20
2x = -20 - 4
2x = -24
x = -12
zadanie 2
1.
8=(-5)-(+8)-(-5)
8 = -5 - 8 + 5
8 = -8
sprzecznosc
2.
-23+(-25)-(-23)=(+13)
-23 - 25 + 23 = 13
-25 = 13
sprzecznosc
3.
-15 - (-26)+4-26+24
-15 + 26 + 4 - 26 + 24 = 11 - 22 + 24 = -11 + 24 = 23
4.
[-(-4)-(-10)+(-16)]-(50-13) =
= 4 + 10 - 16 - 37 = 14 - 53 = -39
5.
(-45) : (-3)- (-11) x 3 = 15 + 33 = 48
6.
(-2)do potęgi trzeciej +(-8) :(-1)-(-35):(-7) =
= -8 + 8 - 5 = -5
7.
[63: (-9)+(-13)] x (-8) =
= -7 + 104 = 97
jesli masz przed nawiasem znak minus, wszystkie liczby w nawiasie zmienija znak