Question

resolva as equações
a) 5x+7=2x+15
b)2 (x - +6)+7=3x9
c)7x8+2x+10=x+8
d)x/2+5=3/4
e)3/4x+7/8=2x-3/2

Answer 1

a)5x+7=2x+15
5x-2x=15-7
3x=8
x=8/3 = 2,6

b)2x-12+7=3x+9
2x-3x=9-7+12
-x=14 (-1)
x=-14

c)7x8+2x+10=x+8
56+2x+10=x+8
2x-x=8-10-56
x=-58