7a + 6 = -36
Subtract 6 from both sides: 7a = -42
Divide both sides by 7: a = -6
a = -6
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a + 18 = 7a a-a +18 = 7a-a 18 = 6a 18/6 = 6a/6 3 = a 3=a
Collect like terms: 9a -7a = 9 - 15, ie 2a = -6, so a = -3
4a-2=7a-6 4=3a a=4/3
6+7a+6b
6 + 6 - 6 * 6 - 6 = 6 + 6 - 36 - 6 = -30