13х - 15 - 3(3 + 2х) = - 3
13х - 15 - 9 - 6х = - 3
13х - 24 - 6х = - 3
13х - 6х = 24 - 3
7х = 21
х = 21 : 7
х = 3
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13х - 15 - 3(3 + 2х) = - 3
13х - 15 - 9 - 6х = - 3
13х - 24 - 6х = - 3
13х - 6х = 24 - 3
7х = 21
х = 21 : 7
х = 3