2x+x
2x = x+x
so 2x+x is
x+x+x = 3x
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2x + x + 4 +2x = x + 20 5x + 4 = x + 20 5x - x = 20 - 4 4x = 16 x = 4
x + 2x + 6x = 9x
3x + 2x - 8x + 2x = -x
2x2 + 2x = 2x(x+1)
(2x + 1) + (x*x - 2x + 1) = x^2 + 2x - 2x + 1 + 1 = x^2 + 2