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x+ x =45
---
2
x
--- = 45-x
2
x= 2(45-x)
x= 90- 2x
3x=90
x=30← RPTA
Espero haberte ayudado y BUENA SUERTE
x+x/2=45
realizamos la suma de fracciones:
2x+x / 2 = 3x/2
3x/2=45
3x=90
x=90/3
X=30
De esta manera, nos queda que, 30+15 (su mitad) = 45