2a+3a-7=5a-7
3x-y+2x=5x-y
-x+2y-3x=-4x+2y
4-2x-7x+2=6-9x
2x-3y+2y-3x-x+y=-2x
3a-6
tego ostatniego niestety nie wiem :(
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2a+3a-7=5a-7
3x-y+2x=5x-y
-x+2y-3x=-4x+2y
4-2x-7x+2=6-9x
2x-3y+2y-3x-x+y=-2x
3a-6
tego ostatniego niestety nie wiem :(