If 3a+5=5a+3, then:
3a+5 - 3a = 5a+3 - 3a
5=2a+3
5 - 3=2a+3 - 3
2=2a
a=1
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5a - 5 = 7 + 2a ( subtract 2a from both sides) 3a - 5 = 7 (add 5 to both sides) 3a = 12 ( divide both sides by 3) a = 4
7a + 4 = 5a + 7 7a = 5a + 3 2a = 3 a = 3/2
5a(a(a-5)+3)
9a+21 3(3a+7)
3a + 4 = 4a - 3 4 = a -3 (subtract 3a from each side) 7 = a (add 3 to both sides) a = 7