-x-14.
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x+7 = 2x 2x = x+7 2x-x = 7 x = 7
-7 +2x = x + 8 2x - x = 7 + 8 x = 15
f(x) = 2x + 8 f(x) = -7 → 2x + 8 = -7 → 2x = -15 → x = -7½ = -7.5
It equals 7 since 2x = 7+x where 2 has 2x but 7 is one x because there is only one x . So it is 7.
2x + 52 = 7 2x + 25 = 7 2x = 7 - 25 2x = -18 x = -18/2 x = -9