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a - b = 7
________ -
2b = 30
b = 15
a - b = 7
a = 7 + b
a = 15 + 7
a = 22
a x b = 22 x 15 = 330
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x = 37 - y
x - y = 7
37 - y - y = 7
37 - 2y = 7
-2y = 7 - 37
-2y = -30
2y = 30
y = 15
x + y = 37
x + 15 = 37
x = 37 - 15
x = 22
22 * 15 = 330