x2 - 7x = 60
x2 - 7x - 60 = 0
(x - 12) (x + 5) = 0
x = 12 or x = -5
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No. An equation must be equal to something, that's why its called an equation. 15x = 60 is an equation, in which case x equals 4
x=100
ln 60 = a
You cannot solve 1 linear equation in 2 unknown variables. You need at least two independent equations.
cos60= 1/2 sin60=1.732/2