The equations are
The second equation is .
Apply division property of equality: if a = b, then.
(Divide each side by negative 6)
(Cancel common terms)
(Divide: )
Substitute 5 for y in equation (1).
(Multiply: )
Apply addition property of equality: if a = b, then a + c = b + c.
(Add 15 to each side)
(Apply Additive inverse property: - 15 + 15 = 0)
(Add: )
Apply division property of equality: if a = b, then.
(Divide each side by 3)
(Cancel common terms)
(Divide: )
Substitute 7 for x in equation (3).
(Multiply:)
Apply addition property of equality: if a = b, then a + c = b + c.
(Add 14 to each side)
(Apply Additive inverse property: )
(Add: )
Apply division property of equality: if a = b, then.
(Divide each side by 5)
(Cancel common terms)
(Divide: )
The solution is .
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