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b) (4a-7b)-(2a+3b) = 4a - 7b - 2a - 3b = 2a - 10b
c) (2p-r)+(2r-p) = 2p - r + 2r-p = p + r
d) (x+y)+(x-z)+(z-y) = x + y + x - z + z-y = 2x
b) 4a - 7b - 2a - 3b = 2a - 10b
c) 2p - r + 2r - p = p + r
d) x + y + x - z + z - y = 2x ( z i y się redukują)