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x = 5
b) 7n + 2 = 6n - 3
7n -6n = -3 -2
n= -5
c) -x+25 = 2x -2
-x-2x=-2-25
-3x = -27 / : 3
x = 9
d) -9z -7= -z -6
-9z +z = -6 +7
-8z = 1 /:(-8)
z= minus jedna ósma
mam nadzieje że pomogłam ;):)
8x+5=7x
8x-7x=-5
x=-5
spr.8×(-5)+5=7×(-5)
-40+5=-35
-35=-35
L=P
b)
7n+2=6n-3
7n-6n=-3-2
n=-5
spr.7×(-5)+2=6×(-5)-3
-35+2=-30-3
-33=-33
L=P
c)
-x+25=2x-2
-x-2x=-2-25
-3x=-27
x=-27:-3
x=9
spr.-9+25=2×9-2
16=18-2
16=16
L=P
d)
-9z-7=-z-6
-9z+z=7-6
-8z=1
z=1:-8
z=-⅛
spr.-9×(-⅛)-7=⅛-6
1⅛-7=-5⅞
-5⅞=-5⅞
L=P
8x - 7x = -5
x = -5
spr. 8 * (-5) + 5 = 7 * (-5)
-40 + 5 = -35
-35 = -35
b)7n+2=6n-3
7n - 6n = -3 - 2
n = -5
spr. 7 * (-5) + 2 = 6 * (-5) - 3
-35 + 2 = -30 - 3
-33 = -33
c) -x+25=2x-2
-x -2x = -2 - 25
-3x = -27 / : (-3)
x = 9
spr. -9 + 25 = 2 * 9 - 2
16 = 18 - 2
16 = 16
d) -9z -7= -z-6
-9z + z = -6 + 7
-8z = 1 /: -8
z = -1/8
spr. -9 * (-1/8) - 7 = 1/8 -6
9/8 - 7 = 1/8 - 6
1.125 - 7 = 0.125 - 6
-5.875 = -5,875