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-3x + 5 = x - 7
-3x - x = -7 - 5
-4x = -12
x = 3

Nilai dari x + 8 = 3 + 8 = 11

No 8
1/4(x - 10) = 2/3 x - 5
{1/4(x - 10) = 2/3 x - 5} 12
3(x - 10) = 8x - 60
3x - 30 = 8x - 60
3x - 8x = - 60 + 30
-5x = -30
x = 6