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substitute the values of the variable inside the algebraic expression.

for example:
find the value of x when y = -4, z= 2, a=3, z= 0


0.5x + y -z (a+b)= 8


0.5x -az -bz +y = 8


0.5x -4=8


0.5x= 4


x= 4/0.5= 8

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Q: How do you find the value of a algebraic expression?
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