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2014-03-25T21:18:55+02:00
(a+3)*7+48=44*3
(a+3)*7=132-48
(a+3)*7=84
a+3=84:7
a+3=12 => a=12-3 => a=9
2014-03-25T21:27:14+02:00
[(a+3)·7+48]:3=44⇒(a+3)·7+48=44·3.
(a+3)·7=132-48⇒a+3=84:7.
(a+3)=12⇒a= \frac{12}{3}
a=4.