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2a - 3 +a-2= 12+4a-5a+2
3a -5 = 14-a
3a+a = 14+5
4a = 19
a = 19/4
Respuesta es 19/4
Comprobación:
2(19/4) - 3 +({19/4 }-2)= 12+4(19/4)-5(19/4)+2
19/2 -3 +(19-8/4) = 12-19 -95/4 +2
19/2 -3 +11/4 = 33 - 95/4
38-12+11/4 = 132-95
37/4=37/4