Explicación paso a paso:
a) 21x+14-20x+15=4x-8+1
21x-20x-4x=1-8-14-15
-3x=-36
x=-36/-3
x=12
b)15x+10=72-16x
15x+16x=72-10
31x=62
x=62/31
x=2
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Explicación paso a paso:
a) 21x+14-20x+15=4x-8+1
21x-20x-4x=1-8-14-15
-3x=-36
x=-36/-3
x=12
b)15x+10=72-16x
15x+16x=72-10
31x=62
x=62/31
x=2