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 = (3/3)*x-7 // - (3/3)*x-7
y-((3/3)*x)+7 = 0
y-x+7 = 0
y-x+7 = 0 // - y+7
-x = -(y+7) // * -1
x = y+7
x = y+7
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