6x - 9 = 21
6x = 21 + 9
6x = 28
x = 28/6
Reduce to:
x = 14/3
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It is -6x - 9
If you mean 6x+9 = 63 then the value of x works out as 9
There is insufficient information to answer this question. If you mean, what does x equal for: 9 + 6x = 2x ...then the answer is: 9 = 2x - 6x = -4x ...which is equal to: x = -9/4 If you mean, what does x equal for: 9 + 6x + 2x = 0 ...then the answer is: 8x = -9 ...which is equal to: x = -9/8
6x+3y = -9 3y = -6x-9 y = -2x-3 Therefore the perpendicular slope is 1/2
If you mean 6x+3-27+15 then it is an expression that can be simplified to: 6x-9