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2. 100-150x+200x=100+50x
3. 15km+9k-12m
4. a+2a+3a=6a
5. -24c-36d-60
6. -6w+9z+7,5
7. -24t-48t+8=-72t+8
5(20-30x+40x) = 100 - 150x + 200x = 100 + 50x
6 (2,5km +1,5k - m2) = 15km + 9k - 6m2
4(1/4a +1/2a +3/4a) = a + 2a + 3a = 6a
12(-2c -3d - 5) = -24c - 36d - 60
0,75(-8w +12z +10) = -6w + 9z + 7,5
-8(3t +6t -1) = -24t - 48t -1 = -24t - 1