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2(3x-4)=10
6x - 8 = 10
6x = 10 + 8
6x = 18 /:6
x = 3
b)
-3(5+2x)=-15
-15 - 6x = -15
-6x = -15 + 15
-6x = 0
x = 0
c)
4x + 12-2=-6
4x + 10 = - 6
4x = - 6 - 10
4x = - 16 /:4
x = - 4
6x= 10+8 (przy przenoszeniu na 2 stronę równania zmieniamy znaki)
6x= 18 //:6
x= 3.
b) -15-6x= -15
-6x= -15+15
-6x= 0 (równanie niemożliwe)
c) 4x+10= -6
4x= -6-10
4x= -16//:4
x= -4