\(c,140-5x=10\\ \Rightarrow5x=130\\ \Rightarrow x=26\\ d,48-3\left(x+5\right)=24\\ \Rightarrow3\left(x+5\right)=24\\ \Rightarrow x+5=8\\ \Rightarrow x=3\\ e,4x+36:4=25\\ \Rightarrow4x+9=25\\ \Rightarrow4x=16\\ \Rightarrow x=4\\ f,\left(15+x\right):3=3^{15}:3^{12}\\ \Rightarrow\left(15+x\right):3=3^3\\ \Rightarrow\left(15+x\right):3=27\\ \Rightarrow15+x=81\\ \Rightarrow x=66\)
c: =>5x=130
hay x=26
d: =>3(x+5)=24
=>x+5=8
hay x=3
e: =>4x+9=25
=>4x=16
hay x=4
f: =>x+15=81
hay x=66
c) \(5x=130\Leftrightarrow x=26\)
d) \(3\left(x+5\right)=24\Leftrightarrow x+5=8\Leftrightarrow x=3\)
c, 140 -5x = 10
5x= 140-10
5x= 130
x= 130 :5
x= 26
d, 48 - 3.(x+5)= 24
3.(x+5)= 48 -24
3.(x+5)= 24
(x+5)= 24 : 3
(x+5)= 8
x= 8-5
x=3
e, 4x +36:4 = 25
4x + 9 =25
4x= 25 - 9
4x= 16
x= 16:4
x= 4
f, (15+x) : 3= 3^15 : 3^12
(15+x) :3 = 3^3
(15 + x) : 3 = 27
(15+x) = 27.3
(15+x) = 81
x= 81- 15
x= 66
