If -LSB- math -RSB- 4a = e -LSB- / math -RSB- , -LSB- math -RSB- \ frac -LCB- b -RCB- -LCB- 4 -RCB- = e -LSB- / math -RSB- , -LSB- math -RSB- c + 4 = e -LSB- / math -RSB- , -LSB- math -RSB- d - 4 = e -LSB- / math -RSB- and -LSB- math -RSB- a + b + c + d = 100 -LSB- / math -RSB- , then what is the value of -LSB- math -RSB- e -LSB- / math -RSB- ?
What is x in this math equation ?