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4) x = 11

5) x = -6

6) x = 18

7) x = 21

Step-by-step explanation:

(the equations and the answers are bolded)

x + 9 = 21

subtract 9 from both sides of the equation

x + 9 - 9 = 21 - 9

x = 21 - 9

x = 11

21 - x = 27

add x to both sides

21 - x + x = 27 + x

21 = 27 + x

subtract 27 from both sides

21 - 27 = 27 - 27 + x

-6 = x

21 = x + 3

subtract 3 from both sides

21 - 3 = x + 3 - 3

21 - 3 = x

21 - 3 = 18

18 = x

x - 9 = 12

add 9 to both sides

x -  9 + 9 = 12 + 9

x = 12 + 9

x = 21

marco saved more.   he saved $35 more.

step-by-step explanation:

1+2+3+4+5+6+7+8+9+10 = 55

2*10 = 20

55-20 = 35