1.
5x+9
x
5, 9
2.
10 - 12x
10, 12
3.
16 + x
16
4.
2x + 3
2, 3
5.
6 + 15x
6, 15
1) x + 5 = 2
x = 2 - 5
x = -3
to check:
x + 5 = 2
(-3) + 5 = 2
2 = 2
2) x - 10 = 22
x = 22 + 10
x = 32
x - 10 = 22
(32) - 10 = 22
22 = 22
3) x - 27 = 8 + 10
x - 27 = 18
x = 18 + 27
x = 45
x - 27 = 8 + 10
(45) - 27 = 8 + 10
18 = 18
4) -11 + x + (-48) = 25
x - 11 - 48 = 25
x - 59 = 25
x = 25 + 59
x = 84
-11 + x + (-48) = 25
-11 + (84) + (-48) = 25
25 = 25
5)x - (-16) = 12 + 13
x + 16 = 25
x = 25 - 16
x = 9
x - (-16) = 12 + 13
(9) + 16 = 25
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Answers & Comments
1.
5x+9
x
5, 9
2.
10 - 12x
x
10, 12
3.
16 + x
x
16
4.
2x + 3
x
2, 3
5.
6 + 15x
x
6, 15
1) x + 5 = 2
x = 2 - 5
x = -3
to check:
x + 5 = 2
(-3) + 5 = 2
2 = 2
2) x - 10 = 22
x = 22 + 10
x = 32
to check:
x - 10 = 22
(32) - 10 = 22
22 = 22
3) x - 27 = 8 + 10
x - 27 = 18
x = 18 + 27
x = 45
to check:
x - 27 = 8 + 10
(45) - 27 = 8 + 10
18 = 18
4) -11 + x + (-48) = 25
x - 11 - 48 = 25
x - 59 = 25
x = 25 + 59
x = 84
to check:
-11 + x + (-48) = 25
-11 + (84) + (-48) = 25
25 = 25
5)x - (-16) = 12 + 13
x + 16 = 25
x = 25 - 16
x = 9
to check:
x - (-16) = 12 + 13
(9) + 16 = 25
25 = 25