10)2.x+3x+4x=180

x(2+3+4)=180

x.9=180

x=180:9

x=20

Vậy x=20

7) \(180-2.\left(x+5\right)^2=130\)

\(2.\left(x+5\right)^2=180-130\)

2.(x+5)²=50

(x+5)²=50:2

(x+5)²=25

x+5=5  hoặc x+5=-5

x=5-5                x=-5-5

x=0                     x=-10

Vậy x=0 hoặc x=-10

6)\(3.\left(x+1\right)-2^3.2=11\)

\(3\left(x+1\right)-2^4=11\)

\(3.\left(x+1\right)=11+16\)

3.(x+1)=27

x+1=27:3

x+1=9

x=9-1

x=8

Vậy x=8

5)\(2^{x+1}=64\)

\(\Rightarrow2^{x+1}=2^6\)

\(\Rightarrow x+1=6\)

x=6-1

x=5

-2x2+x-3=0

-2x2+x=0+3

-2x2+x=3

Mà -2 <= 0,2>0 =>x=0

3)x:5-27:5=18

=>(x-27):5=18

x-27=18.5

x-27=90

x=90+27

x=117

Vậy x=117