x = 16
3x = 48
divide both sides by three to get x by itself
x=16
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16
3x + 10x - 48 = 0 13x = 48 x = 3.692307692
3x+12=x+48: 3x-x=-12+48 2x=36 x=18
really depends. 12x - 8y = 48 3x - 2y = 12. You can't decide, but one ordered pair is (4,0)
2x+3x = 5x
If: 3x = 15 Then: x = 5