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4y + 8 - 8 = 2y - 8 2x + 6 - 6 = 4x - 12 - 6
4y - 2y = 2y - 2y - 8 2x = 4x - 18
2y = -8 2x - 4x = 4x - 4x - 18
y = -8 : 2 -2x = -18
y = -4 x = -18 : -2
x = 9
4 - 4p = 3p + 15
4 - 4 - 4p = 3p + 15 - 4
4p = 3p + 11
4p - 3p = 3p - 3p + 11
p = 11