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8x + 14 = 2x - 4
8x - 2x = -4 - 14
6x = -18
x = -18 / 6
x = -3
maka nilai : 5x - 3 = 5(-3) - 3
= -15 - 3 = -18
4x+7 = x -2
4x - x = -2-7
3x = -9
x = -9/3 = -3
maka 5x-3 = 5(-3) - 3 = -15-3 = -18