= (5x - 30) + (3 - 7)
= 5x - 30 - 4
= 5x - 34
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3x+7=5x-13 ----> 3x-5x=-13-7 ----> -2x=-6 -----> x=3
3x + 7 = 5x + 13 3x - 5x = 13 - 7 -2x = 6 -x = 3 x = -3
5x + 8 = 2x + 7 5x - 2x = -8 + 7 3x = -1 x = -1/3 (5 x -1/3 + 8 = 6 1/3; 2 x -1/3 + 7 = 6 1/3; QED)
5x - 3 + 2x + 7 = ?7x + 5 = ?
If: 10x+7 = 5x+22 Then: 10x-5x = 22-7 And: 5x = 15 So: x = 3