7W + 4 - 3W = 15
gather the w's together
4W + 4 = 15
subtract 4 from each side
4W = 11
divide each sides integers by 4
W = 11/4
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depends what 'a' =
-0.5
Y=15/(2c+2x)
5x+y=-7 3x+y=15 8=D
15 + n = 24 (subtract 15 from both sides) n = 9