x = (c - b)/a in a deliberately complicated form!
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The equation contains variables which are only raised to the first power.
Ax + By = C By = -Ax + C y = (-A/B)x + C/B
It is: 3x2+6x-11 = 0
It is a straight line with gradient -A/B and intercept C/B.
ax + b = 15 or ax + b = -15