If it's not what You are looking for type in the equation solver your own equation and let us solve it.
a in (-oo:+oo)
a/2.4 = 2.7 // - 2.7
a/2.4-2.7 = 0
0.41666667*a-2.7 = 0 // + 2.7
0.41666667*a = 2.7 // : 0.41666667
a = 2.7/0.41666667
a = 6.47999995
a = 6.47999995
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