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18x + 30 = 60 + 3x
18x - 3x = 60 - 30
15x = 30
x = 30/15
x=2
b) 3.(x-6)=(2x+1).5-8.9
3x - 18 = 10x + 5 - 72
-10 + 72 = 10x - 3x + 5
62 - 5 = 7x
57 = 7x
x =57/ 7
18x +30 = 60 + 3x , aquí ya se resuelve normal
18x - 3x = 60 - 30
15x = 30
x = 2
b) 3 ( x-6 ) = (2x+1).5 - 8.9
3x - 18 = 10x + 5 - 72
72 - 18 = 10x - 3x +5
54 -5 = 7x
49 = 7x
x = 7