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its 3.
5ˣ + x = 1285ˣ = 128 - xLHS: Power curve from above the asymptote of 0 for x < 0 , climbs to 1 at x = 0 , and goes unbounded for x > 0 .RHS: Line sloping down from (0, 128) to (128, 0) .They intersect only once.5³ = 128 - 3125 = 125x = 3
its 3.
5ˣ + x = 128
5ˣ = 128 - x
LHS: Power curve from above the asymptote of 0 for x < 0 , climbs to 1 at x = 0 , and goes unbounded for x > 0 .
RHS: Line sloping down from (0, 128) to (128, 0) .
They intersect only once.
5³ = 128 - 3
125 = 125
x = 3