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-3x+2=-7
-3x=-7-2
-3x=-9 /:(-3)
x=3
b)
2x=3x-2
2x-3x=-2
-x=-2/*(-1)
x=2
c)
4-2x=2
-2x=2-4
-2x=-2/ :(-2)
x=1
d)
5x-7=-8
5x=-8+7
5x= -1 /:5
x= -1/5
odp. Liczba 3 spełnia równanie " a "
-3x+2=-7
-3x=-2-7
-3x=-9 | : (-3)
x=3
b
2x=3x-2
2x-3x=-2
-x=-2 | : (-1)
x=2
c
4-2x=2
-2x=2-4
-2x=-2 | : (-2)
x=1
d
5x-7=-8
5x=-8+7
5x=-1 | :5
x=-1/5