10a-37=6a+51
-6a -6a subtract 6a from both sides and the 6a's cancel
4a-37=51
+37 +37
4a=88
/4 /4
a=22
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22
-6a + 8 = 2 -6a = -6 a = 1
If you mean: 15a = 6a - 90 then the variable a works out as -10. If you mean 15a + 6a - 90, then it equals 21a - 90.
6a + 4 = 5a - 2 means that 6a - 5a = -2 - 4 which gives a = -6
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