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a. -15x=60
a. x=60/15
a. x=4
la respuesta es 4
-15x = 60 60 = 60
x = 60/-15
x= -4 este es el numero
b. -7 + x = 18 Comprobemos: -7 + 25 = 18
x = 18 + 7 18 =18
x = 25 grados que debe aumentar