3x + 7 = x + 13
Subtract 7 from each side:
3x = x + 6
Subtract x from each side:
2x = 6
Divide each side by 2:
x = 3
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3x+7=4x 7=4x-3x 7=x
7-3x = -4x + 13x = 6
3x - 8 = 7 so x = 5
7x = 3 x = 3/7
3x+7=4x-73x=(-)7+4x-4x(-)1x=(-)7________(-)1x=7add (-3x) to each side of equation3x +7 = 4x-3x +3x +7 = 4x -3x0 +7= 1x7=x