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No, it's an equation. x is the variable and in this case:
12 - x = 7
x = 12 - 7 = 5
x2+12x+36=0 2x+12x+36=0 14x+36=0 14x=-36 x=-36/14 x=-2 4/7
5x-3 = 11+12x 5x-12x = 11+3 -7x = 14 x = -2
It is: 12x
17
No solution. Multiply second equation by 3 and get 12x + 6y = 0 but already stated 12x + 6y = 9...