Question

Resolva, em R, as equações a) 5x-25=0 b)7x-8=3x+20 c)5(x+4)=3(x+2) d)7(3x+5)+7=10(2x-1)+11

Answer 1

A) 5x=25
x=25/5
x=5
B)7x-3x=20+8
4x=28
x=28/4
X=7
C)5x+20=3x+6
5x-3x=6-20
2x=-14
X=-14/2
X=-7
D)21x+35+7=20x-10+11
21x-20x=-10+11-35-7
X=-43