a + 6a - 9 = 30
7a - 9 = 30
7a = 30 + 9
7a = 39
a = 39/7
a = 5.571 (to 3 decimal places only).
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320 tolerance +/- 20 ? Did I get it right?
26 = 30 - 6a Taking 30 off each side gives, 26 - 30 = -4 = -6a Dividing each side by -6 gives, -4 / -6 = a, thus a = 2/3 or 0.667
-6a + 8 = 2 -6a = -6 a = 1
3(6a + 5) + 30 18a + 15 + 30 18a + 45
A=2