n2 = 20 + n
so n2 - n - 20 = 0
that is (n - 5)(n + 4) = 0
so that n - 5 = 0 or n + 4 = 0
n = 5 or n = -4
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To solve for x, we'd have to know what this expression equals.
y=16 x= -4
-7m + 20 = -17m - 1010m = -30m = -3
-3x + 5 = 20 -3x = 15 x = -5
6y3 + 8y2 - 15y - 20 is an expression, not an equation (or inequality). An expression cannot be solved.The expression factorises to (3y + 4)*(2y2 - 5)