X + 4 = 19
subtract 4 from each side of the equation
X + 4 - 4 = 19 - 4
X = 15
=======check in original equation
(15) + 4 = 19
19 = 19
=======checks
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if 3x+5=x+19 then x=7
3x+7=19 3x=12 minus 7 from both sides x=4 divide by three on both sides leaving just what x equals
1
It is (-1, 3).
2x + x + 4 +2x = x + 20 5x + 4 = x + 20 5x - x = 20 - 4 4x = 16 x = 4