-3/10x = -9
Multiply each side by 10x:
-3 = -90x
Divide each side by -90:
x = -3/-90 = 1/30
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You cannot solve one equation in three unknowns. You need three independent equations.
18=3(3x-6)
Not sure that you can slove anything. -2w = r + s is one linear equation in 3 unknown variables. You need three independent equations in 3 variables to be able to solve them.
Add 2.9 to both sides. y = 8.2
If you mean: 10ac -x/11 = -3 then a as the subject is a = (-33+x)/110c