- 3 x - 15 + 9 x - x = 5 - x + 16
5 x + x = 21 + 15
6 x = 36
x = 36 : 6
x = 6
Verific:
5 x - 15 = 21 - x
5 · 6 - 15 = 21 - 6
30 - 15 = 15 ( corect )
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7 x - 6 + 5 x - 4 = 2 - 3 x - 4 - x
12 x - 10 = - 4 x - 2
12 x + 4 x = - 2 + 10
16 x = 8
x = 8 / 16
x = 1 / 2
Verific:
12 x 1 / 2 - 10 = - 4 × 1 / 2 - 2
6 - 10 = - 2 - 2 = - 4
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2 y + 18 - 5 y + 4 y = 28 - 3 y + 14
y + 18 = 42 - 3 y
y + 3 y = 42 - 18
4 y = 24
y = 24 : 4
y = 6
Verific:
y + 18 = 42 - 3 y
6 + 18 = 42 - 3 x 6
24 = 42 - 18 ( corect )
