If you work this out, the results are as follow (in bold):
4x + 7 = -3x
changes to
7 = -7x
changes to
-1 = x is the anwser
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4x plus 7 plus 3x equals 19 plus xx = 2
4x+7-3x = 15 4x-3x = 15-7 x = 8
19 (7 + 12 = 4x - 3x)
3x + 7 = -4x + 28 implies 7x + 7 = 28
-3x=-21+4x-3x-4x=-21+4x-4x-7x=-217x=217x/7=21/7x=3