If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
y = (1/2)*x-7 // - (1/2)*x-7
y-((1/2)*x)+7 = 0
(-1/2)*x+y+7 = 0
y-1/2*x+7 = 0 // - y+7
-1/2*x = -(y+7) // : -1/2
x = (-(y+7))/(-1/2)
x = 2*(y+7)
x = 2*(y+7)
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