a)
x=3 |·2
2x=6 |+3
2x+3=9 |-5x
-3x+3=9-5x |+1
-3x+4=10-5x |·2
-6x+8=20-10x
b)
x=-1 |+4x
5x=-1+4x | -3
5x-3=-4+4x |+2
5x-1=-2+4x |·(-1)
-5x+1=2-4x |+4
-5x+5=6-4x
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a)
x=3 |·2
2x=6 |+3
2x+3=9 |-5x
-3x+3=9-5x |+1
-3x+4=10-5x |·2
-6x+8=20-10x
b)
x=-1 |+4x
5x=-1+4x | -3
5x-3=-4+4x |+2
5x-1=-2+4x |·(-1)
-5x+1=2-4x |+4
-5x+5=6-4x