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6x - 15 = 45 + 4x
6x - 4x = 45 + 15
2x = 60
x = 60/2
x = 30
Solución :
x = 30
6x-15=1.(45+4x)
6x-15=45+4x
6x-4x=45+15
2x= 60
x=60 entre 2
x=30