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/7.4 = 6.79 // - 6.79
a/7.4-6.79 = 0
0.13513514*a-6.79 = 0 // + 6.79
0.13513514*a = 6.79 // : 0.13513514
a = 6.79/0.13513514
a = 50.24599819
a = 50.24599819
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