Question 651695
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Hi,
the idea is to take the steps necessary so that the {{{variable}}} is isolated on one side of the EQ
2x+3x-5+7=10x+3-6x-4    ||combine Like Terms on each side of EQ
 5x + 2 = 4x - 1        || combine Like Terms from BOTH sides of the EQ
5x+ 2 - 4x - 2 = 4x-1  - 4x -2
  x = -3   ||Note: when x has been isolated, the we can Read x = -3 !

7=-5(2a-1)-(-11a+6)  ||"eliminate the parentheses"  Yes!
7 = -10a + 5 +11a - 6   ||combine Like Terms on each side of EQ
7 = a - 1               || combine Like Terms from BOTH sides of the EQ
8 = a