resuelve las ecuaciones:
a. 3 x - 8 = - 2 x + 9
b. 39 x + 85 = 49
c. x - 7 = 8
d. 9 x + 10 = 8 x + 9
e. x + 60 = 30
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a. 3 x - 8 = - 2 x + 9
3x+2x= 9-8
5x=-1
x=-1/5
b. 39 x + 85 = 49
39x=49-85
39x=-36
x=-36/39
c. x - 7 = 8
x=8+7
x=15
d. 9 x + 10 = 8 x + 9
9x-8x=9-10
x= -1
e. x + 60 = 30
x=30-60
x=-30