It's a linear equation in 'x'.
It has exactly one solution.
Here's how to find it:
-6x = 30
Divide each side by -6:
x = -5
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24
30 - 12 = 18
2x + 6 - 6x = 30= 6 - 4x = 30= -4x = 24= 4x = -24= x = -6
5x6 = 30 -10 = 20.
X equals 4