x*12345 + x*12345 = 74070
( x + x ) *12345 =74070
2x = 74070 : 12345
2x = 6
x= 6: 2
x=3
x * ( 12345 + 12345 ) = 74070
x * 152399025 = 74070
x = 74070 : 152399025
x = \(\frac{2}{4115}\)
x* 12345 + x* 12345=74070
x* 12345 = 74070 :2=37035
x = 37035 : 12345=3
Vậy x = 3
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