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-7x=70
x=70 / -7
x= -10
x+8 = -10 +8 = -2
-5x - 2x = 77 - 7
-7x = 70
x = 70 : - 7
x = - 10
Nilai dari x + 8
x + 8 = - 10 + 8
= - 2