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5x=21+4
5x=25
x=25/5
x=5
b.7x-3=5x+9
7x-5x=9+3
2x=12
x=12/2
x=6
c.4x+5>2x-5
4x-2x>-5-5
2x>-10
x>-10/5
x>-2