5*(2*y + 1) = 7*( - 3*y - 3)

10*y + 5 = - 21*y - 21

10*y + 21*y = - 21 - 5

31*y = - 26

y = - 26/31

2)

(2/3)*y + 3*y = 8 + 1

(11/3)*y = 9

y = 27/11

3)

(6*P)/h = a + b

b = (6*P)/h - a

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