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5y -5 = 4y
5y -4y = 5
y = 5
b. 4(3 -2y) = 15 -7y
12 -8y = 15 -7y
-8y +7y = 15 -12
-y = 3
y = -3
c. 5x +7(3x +2) = 6(4x +1)
5x +21x +14 = 24x +6
5x +21x -24x = 6 -14
2x = -8
x = -8/2
x = -4
Itu jawabannya.