a) (x - 25) - 130 = 150
=> x - 25 = 150 + 130
=> x - 25 = 280
=> x = 280 + 25
=> x = 305
c) 435 + 5.x = 135
=> 5.x = 135 - 435
=> 5.x = - 300
=> x = -300 : 5
=> x = - 60
\(\left(x-25\right)-130=150\)
\(\left(x-25\right)=150+130\)
\(\left(x-25\right)=280\)
\(x=280+25\)
\(x=305\)
a. (x - 25) - 130 = 150
x - 25 = 280
x = 305
b. 125 + (145 - x) = 175
145 - x = 50
x = 95
c. 435 + 5x = 135
5x = -300
x = -60
\(a,\left(x-25\right)-130=150\)
\(x-25=280\)
\(x=280+25\)
\(x=305\)
\(b,125+\left(145-x\right)=175\)
\(145-x=50\)
\(x=95\)
\(c,\)\(435+5x=135\)
\(5x=-300\)
\(x=-60\)
( x - 25 ) - 130 = 15
x - 25 = 15 + 130
x - 25 = 145
x = 145 + 25
x = 170
Sửa lại nha :
(x-25)-130=150
x-25 = 150 + 130
x-25 = 280
x = 280 + 25
x = 305
125+(145-x)=175
145-x = 175 - 125
145-x = 50
x = 145 - 50
x = 95
435 + 5.x = 135
5.x = 135 - 435
5.x = -300
x=-300 : 5
x=-60