9x2 + 7x = 2
9x2 + 7x - 2 = 0
9x2 + 9x - 2x - 2 = 0
9x(x + 1) - 2(x + 1) = 0
(9x - 2)(x + 1) = 0
x ∈ {-1, 2/9}
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It can be simplified in the form of: 2x3+9x2-7x-34 = 0
x2+7x+3 = 0 Using the quadratic equation formula the solutions are:- x = -6.541381265 or x = -0.4586187349
If: 11x+25 = 7x+15 then there is only one solution and it is x = -2.5
Given 6x + (7x-8) = -5 6x + 7x - 8 = -5 ==> 13x = 3 therefore, x = 3/13