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-4x+7
2a-3b
-1
7x-3y
6x-4
-2y-11
-5a-b
2.5t-3x
2.=-4x+7
3.=2a-3b
4.=-1
5.=7x-3y
6.=6x-4
7.=-2y-11
8.=-5a-b
9.=2½t-3x
2x - 5x + 7- x = -4x +7
2a + b - 4b= 2a - 3b
x - 2x + 3 + x - 4 = -1
3x - y + 4x - 2y = 7x -3y
2x - 6 + 4x + 2 = 6x - 4
3y - 5 - 5y - 6 = -2y -11
-2a + 2b - 3a - 3b = -5a -b
½t - 2x + 3t - x - t = -3x + 2½t
koniec :):)