y-7=8 (original equation)
y=8+7 (add 7 to the opposite side)
y=15 (combine like terms)
y=15 (final answer)
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that's impossible
This is not Calculus.y=7(Already solved)substiute y=7 into y=8xtherefore 7 = 8xtherefore x = 7/8
5x+y=-7 3x+y=15 8=D