7 y - 4 + y + 5 = 28
7 y + y + 1 = 28
8 y + 1 = 28
8 y = 27
y = 27/8
y = 3.375
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This equation is unsolvable without knowing one of the values of either x or y.
75
22+22+28+28=100.
it equals 28
3x + 7 = -4x + 28 implies 7x + 7 = 28