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-6a + (-10b) + 12b - 18a =
-24a + 2b
b) -7(x - 3y + 1/7z - 2) -3(y + x +z) -18y =
-7x + 21y + 1z + 14 -3y -3x -3z - 18 =
-10x + 19y -2z
c) 2( 1/2a + 0,25b ) -4 ( 1,25a - 3/4b ) - a + b =
1a + 0,5b - 5a + 3b - a - b =
-5a + 2,5
dalej nie ogarniam. mam nadzieje ze pomoglam chociaz troche ;))