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-15 = 8y - 9y
-15 = -y
y = 15
2. 6p + 7 = 5p - 14
6p - 5p = -14 - 7
p = - 21
3. 6p + 3 per 7 = 5p + 5 per 7
6p - 5p = 5 per 7 - 3 per 7
p = 2 per 7
4. 18x - 15 = 19x -7
18x - 19x = -7 + 15
-x = 8
x = -8
5. 4(x + 6) = 3(x + 2)
4x + 24 = 3x + 6
4x - 3x = 6 - 24
x = - 18
6. 2(5x - 6) = 3(3x - 7)
10x - 12 = 9x -21
10x - 9x = -21 + 12
x = -9
8. 6(1 per 2y - 5 per 6) = 8(1 per 4y + 1 per 2)
3y - 5 = 2y + 4
3y - 2y = 4 + 5
y = 9