The equation is .
According to addition property of equality: Add 1.2 to each side.
(Apply additive inverse property: )
(Apply additive identity property: )
(Add: )
According to division property of equality: Divide each side by 3.
(Cancel common terms)
(Divide: )
(Multiply each side by negative one)
(Product of two same signs is positive)
Check:
To check the solution, substitute in original equation.
(Multiply: )
(Subtract: )
Compare the values, the equation is true.
The value of .
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