7z + 6s + s = 7z + 7s
This can then be factorised using 7 as the factor:
7z + 7s = 7(z + s)
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-6s+10 = -5s 5s-6s = -10 -s = -10 s = 10
6s+2s=72 combine like terms 6s+2s=8s set equal to 72 8s=72 divide both sides by 8 to solve for "s". 8s=72 8 8 your answer is s= 72/8 which is 9.
5s - 3 = 3s - 92s = -6s = -3
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5/6s + 3/4 = 11/12 10/12s + 9/12 = 11/12 10/12s = (11 - 9)/12 10/s = 2 s = 5