PRE-ALGEBRA, 2012
80

 PAGE: 249 SET: Exercises PROBLEM: 80

The equation is .

According to addition property of equality: If a = b then a + c = b + c.

Apply commutative property of addition: .

(Apply additive  identity property : )

According to subtraction property of equality: If a = b then .

(Subtract 5 from each side)

(Subtract: )

According to division property of equality: If a = b then .

(Divide each side by 10)

(Cancel common terms)

(Divide: )

Check:

To check,substitute , in .

(Substitute )

(Multiply: )

(Subtract: )

The equality is true.

The solution is .

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