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x^2-(7-x)^2=25
x^2-(49-14x+x^2)=25
x^2-49+14x-x^2-25=0
14x=49+25
14x=72
x=74/14
x=37/7
saludos
x² - (7 - x)² = 25 Resuelves el parentesis aplicas productos notables
(a - b)² = a² - 2ab + b²
x² - (7² - 2(7)(x) + x²) = 25
x² - (49 - 14x + x²) = 25
x² - 49 + 14x - x² = 25 Simplificas x²
14x - 49 = 25
14x = 25 + 49
14x = 74
x = 74/14 Simplificas sacas mitad
x = 37/7
Respuesta.
x = 37/7