Respuesta :

FLORC
To check if correct plug in 4 for X
4-(4×4-7)=5×4-(4+21)
4-(16-7)=20-(4+21)
4-9=20-25
-5=-5
Answer is correct x=4
Ver imagen FLORC
ok. Let's do this!
x - (4x - 7) = 5x - (x + 21)
Distribute the minus into the parenthesis and then get
x -4x +7 = 5x -x -21(combine like terms)
x -4x +7 = 4x -21(combine like terms)
-3x +7 = 4x -21(Add 3x to both sides)
+3x        +3x
7 = 7x -21(Add 21 to both sides)
+21     +21
28 = 7x(Divide 7 from both sides)
4 = x
The answer is x = 4