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3x+4=225
3x=225-4
3x=221
x=221/3
x=73+75+77
x
x+2
x+4
-------
Resultado = 3x+6
_________
3x+6=225
3x=225-6
3x=219
x=219/3
x=73
--------------
x=73
x=73+2(75)
x=73+4(77)
73+75+79=225