20-(2r-5)=25 solve the equation and check the result in the chapter simple equations
Answers
Answer:
r = 0
Step-by-step explanation:
20 - (2r - 5) = 25
=> 20 - 2r + 5 = 25
=> 25 - 2r = 25
=> - 2r = 0
=> r = 0/-2
=> r = 0
Checking:
20 - (2 x 0 - 5) = 25
20 - (0 - 5) = 25
20 - (-5) = 25
20 + 5 = 25
25 + 25
Given : 20 - (2r - 5) = 25
To Find : Solve the equation
and Verify the result
Solution:
20 - (2r - 5) = 25
Subtract 20 from both sides
=> -(2r - 5) = 25 - 20
=> -(2r - 5) = 5
Multiplying by -1 on both sides
=>(2r - 5) = - 5
=> 2r - 5 = - 5
cancel -5 from both sides
=> 2r = 0
Divide by 2 both sides
=> r = 0
Hence value of r = 0
Verification :
20 - (2r - 5) = 25
Substitute r = 0 in LHS
LHS = 20 - (2 * 0 - 5)
= 20-(0 - 5)
= 20 - (-5)
= 20 + 5
= 25
= RHS
LHS = RHS
Hence Verified
Learn More:
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