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OpenStudy (anonymous):
Solve the equation x − 4 = 9
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OpenStudy (aroub):
just add 4 to both sides..
OpenStudy (anonymous):
x - 4 + 4 = 9 + 4 The two fours on the < side cancel each other out, because if you have -4 and add 4, you have 0. What you do to one side you must do to the otherside. So add 4 to the > side as well. So you are left with x = 13.
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