If it's not what You are looking for type in the equation solver your own equation and let us solve it.
f in (-oo:+oo)
f/7 = 1.2 // - 1.2
f/7-1.2 = 0
1/7*f-1.2 = 0 // + 1.2
1/7*f = 1.2 // : 1/7
f = 1.2/1/7
f = 8.40000017
f = 8.40000017
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