-7 (negative 7) transpose the 9x then transpose the 6. divide both sides by 3x and your answer will be -7 =]
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30+12x = 6(5+2x)
8x-3+6x-1 = 12x+614x-4 = 12x+614x-12x = 6+42x = 10x = 5
7
12x - 8 = 10x + 42x = 12x = 6
12x - 6 = 10x +2 12x - 10x = 2 + 6 2x = 8 x = 4