X + 6 = 2X
subtract X from each side
X - X + 6 = 2X - X
6 = X
========check in original equation
(6) + 6 = 2(6)
12 = 12
========checks
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4x+9=2x-6 2x=-15 x=-7.5 x equals -7.5.
2x must equal 12 so x is 6.
2x + 3 = 92x = 9 - 32x = 6x = 6/2x = 3
6 + 2x =2(3 + x)
-2x-6= -2x-6Another answer:-2x-6 = 2x+6-2x-2x = 6+6-4x = 12x = -3