If you want to solve what 'x' is then you would do it like this. 5 + 7x = 75, then take away 5 from both sides to get 7x = 70, then divide both sides by 7 to get x=10.
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-7x + 5 = -9 -7x = -14 7x = 14 x = 2
7x is still the slope, no matter what x equals.
4x+5=7x-8 the ansewr is 3.25
23 = 7x + 7x - 5 = 14x - 5 14x = 23 + 5 = 28 x = 28/14 = 2
7x - 9 = 3x + 5 7x - 3x - 9 = 5 7x - 3x = 5 + 9 4x = 14 x = 14/4