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 = 7-(x/2) // - 7-(x/2)
x/2+y-7 = 0
1/2*x+y-7 = 0 // - y-7
1/2*x = -(y-7) // : 1/2
x = (-(y-7))/1/2
x = 2*(7-y)
x = 2*(7-y)
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