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Mathematics
Holland
12 May, 05:56
3x+7 = x-1 does x = - 4?
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Mayra Murray
12 May, 07:10
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Subtract x from both sides:
(3x - x) + 7 = (x - x) - 1
3x - x = 2x:
2x + 7 = (x - x) - 1
x - x = 0:
2x + 7 = - 1
Subtract 7 from both sides:
2x + (7 - 7) = - 7 - 1
7 - 7 = 0:
2x = - 7 - 1
-7 - 1 = - 8:
2x = - 8
Divide both sides by 2:
2x / 2 = - 8 / 2
2 / 2 = 1:
x = - 8 / 2
The gcd (greatest common denominator) of 8 and 2 is 2:
-8 / 2 = 2 (-4) / 2x1 = 2/2 x - 4 = - 4
x = - 4
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