2x - 4 = 12
Add 4 to each side:
2x = 16
Divide each side by 2:
x = 8
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If: 2x-3y = -15 and x = 4y Then: x = -12 and y = -3
That will depend on the plus or minus value of 12 which has not been given.
The value of 'x' is 50.
-12x = 72 Divde both sides by -12 to find the value of x: x = -6
8