The idea is to replace every "x" by "3", and then do the calculations.
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That factors to 5(x - 4)(x + 4)(x2 + 16)
5x - 8 = 717 5x = 725 x = 725/5 x = 145
x= -11
It is: y = -1/5x-2
7-5x=10-(6x+7) 7-5x=-60x-70 +5x +5x 7=-55x-70 +70 +70 77=-55x Divide -55 -1.4 = x