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2a-5+4a+2a-7+4=5-3a+3a-5a
8a+5a=5+8
13a=13/13
a=1
8a-8=-5a+5
8a+5a=5+8
13a=13 /:13
a=1
2a - 5 + 4a + 2a - 7 +4 = 5 -3a + 3a - 5a
8a - 8 = 5 - 5a
13a = 13
a=1