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-x = 3-10 = -7
x = -7/-1 = 7
b)
2x = 15+5 = 20
x = 20/2 = 10
c)
4x-x = 9
3x = 9
x = 9/3 = 3
d)
3x-x = 50+10 = 60
2x = 60
x = 60/2 = 30
Espero haberte ayudado. ¡Saludos!