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3 ( x - 3) = 3x - 9
5 ( y + z) = 5 y + 5 z
4 ( 3x - y) = 12x - 4y
3 ( 4a - c) = 12a - 3c
- 2( 7 - 4n) = - 14 + 8n
b)
0,2(x - 5y) = 0,2x - y
3 ( a + 1) = a + 3