Explicación paso a paso:
x + 10 = 21
X = 21 - 10
x = 11
18 - x = 18
x = 18 - 18
x = 0
y - 7 = -11
y = -11 +7
y = -4
5x - 8 = 2x + 10
5x - 2x = 10 + 8
3x = 18
x = 18/3
x = 6
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Explicación paso a paso:
x + 10 = 21
X = 21 - 10
x = 11
18 - x = 18
x = 18 - 18
x = 0
y - 7 = -11
y = -11 +7
y = -4
5x - 8 = 2x + 10
5x - 2x = 10 + 8
3x = 18
x = 18/3
x = 6