Solve the equations With decision 1) - y =13 2) - y = 18 3) - y = - (-7) For early Thanks)

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1)-y=13 | *-1 y=13 2) - y=18 | *-1 y=18 3) - y=-(-7) - y=7 (since - on - gives +) - y=7 | *-1 y=-7 should be solved almost nothing here. teach the mathematician
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Answer add