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3y - 5y = -1-15
-2y = -16
y = 8
b. 3a + 18 /4=10a-2/3
3a -10a = -2/3-18/4
-7a = -62/12
a= 0,74
c. 1/2 (3x-6) = 2/3 (2x-3)
3/2x - 3= 4/3x -2
3/2x- 4/3x = -2+3
1/6x= 1
x =6
d. 2 + 11/b =7 1/2
11/b = 11/2
11b = 11(2)
b= 2