x=-1
becaus:
12x+3=2x-7
10x+3=-7 (-2x)
10x=-10 (-3)
x=-1 (divided by 10)
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12x = x + 3 11x = 3 x = 3/11
x2+12x+5 = 3 x2+12x+5-3 = 0 x2+12x+2 = 0
8x-3+6x-1 = 12x+614x-4 = 12x+614x-12x = 6+42x = 10x = 5
12x - 8 = 10x + 42x = 12x = 6
(2x + 3)(2x + 3)