a) 8 - 3*x = 6*x - 10
8 -3x = 6x - 10
-3x - 6x = -10 - 8
-9x = -18 /:(-9)
x = 2
Sprawdzenie
8 -3*2 = 6*2 - 10
8 - 6 = 12 - 10
2 = 2
b) 7*x - 4 = 9 + 8*x
7x - 4 = 9 + 8x
7x - 8x = 9 + 4
-x = 13
x = -13
Sprawdzenie
7*(-13) - 4 = 9 + 8*(-13)
-91 - 4 = 9 - 104
-95 = -95
c) -5 + 7*x = 2*x - 20
-5 + 7x = 2x - 20
7x - 2x = -20 + 5
5x = -15 /:5
x = -3
Sprawdzenie:
-5 + 7x = 2x - 20
-5 + 7*(-3) = 2*(-3) - 20
-5 - 21 = -6 - 20
-26 = -26
d) 8 - 2*x = -4 + 2*x
8 - 2x = -4 + 2x
-2x - 2x = -4 - 8
-4x = -12 /:(-4)
x = 3
Sprawdzenie
8 - 2*3 = -4 + 2*3
8 - 6 = -4 + 6
2 = 2
e) 9*x - 7 = 3*x + 5
9x - 7 = 3x + 5
9x - 3x = 5 + 7
6x = 12 /:6
x = 2
Sprawdzenie:
9*2 - 7 = 3*2 + 5
18 - 7 = 6 + 5
11 = 11
f) 3 - 10*x = 9 - 4*x
3 - 10x = 9 - 4x
-10x + 4x = 9 - 3
-6x = 6 /:(-6)
x = -1
Sprawdzenie:
3 - 10*(-1) = 9 - 4*(-1)
3 - (-10) = 9 - (-4)
3 + 10 = 9 + 4
13 = 13
g) 5 - 2*x = 9 - 6*x
5 - 2x = 9 - 6x
-2x + 6x = 9 - 5
4x = 4 /:4
x = 1
Sprawdzenie:
5 - 2*1 = 9 - 6*1
5 - 2 = 9 - 6
3 = 3
h) -6 + 4*x = 5*x + 4
-6 + 4x = 5x + 4
4x - 5x = 4 + 6
-x = 10
x = -10
Sprawdzenie:
-6 + 4*(-10) = 5*(-10) + 4
-6 + (-40) = -50 + 4
-6 - 40 = -50 + 4
-46 = 46
