Subtract 5 from each side: 16 = 5x + 3x ie 16 = 8x
Divide each side by 8: 2 = x
21 = 5x + 3x + 5
21 - 5 = 8x
16 = 8x
16/2 = x
2 = x
x = 2
Check:
21 = 5(2) + 3(2) + 5
21 = 10 + 6 + 5
21 = 21
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5x+7=3x-21 -7= -7 5x=3x-14 -3x=-3x 2x=-14 2x/2x=2x/-14 x=-7 The Answer Is -7 -
5x+3 = 3x+11 5x-3x = 11-3 2x = 8 x = 4
5x + 5 = 8 -3x 5x = 3 -3x 8x = 3 x = 0.375
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3x+7=5x-13 ----> 3x-5x=-13-7 ----> -2x=-6 -----> x=3