X=7
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-7 +2x = x + 8 2x - x = 7 + 8 x = 15
yes
no x would be 0.5 because two times 0.5 is 1 ( 2x ) and then add 7 equals 8 ( plus seven equals 8 )
3x + 8 = 2x +28 3x - 2x = 28 - 8 x=20
f(x) = 2x + 8 f(x) = -7 → 2x + 8 = -7 → 2x = -15 → x = -7½ = -7.5