Assuming the use of BODMAS, (5 x 2) + (21 x 4) = 10 + 84 = 94
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5x2 + 9x + 4 = (x + 1)(5x + 4).
-1
Assuming that the 2 in "5x2" is a power (5x2), then no, this is not a linear equation. It is a parabolic equation.
3
5x2 + 20x = 5x (x + 4)