This is an expression, not an equation or inequality and so cannot be solved.
b2 + b - 20 can be factorised into (b - 4)(b + 5)
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4x + 20
x2+x-380 = (x+20)(x-19) when factored
36. 4 squared is 16...16 + 20 - = 36.
The solutions are: x = 4, y = 2 and x = -4, y = -2
-5 + (-4) - 12 - 20 - (-10) + 6 = -25