Question

Ajudem!
2m=-4

20x+5=3x+10

100x+10=90x+30

2x+3+8x=10-5x+4

10x=20
2y=40

Answer 1

a)

2m = - 4 
m = - 4/2
m = - 2
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b)
20x + 5 = 3x + 10
20x - 3x = 10 - 5
17x = 5
x = 5/17
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c)
100x + 10 = 90x + 30
100x - 90x = 30 - 10
10x = 20
x = 20/10
x = 2
--------------------------------------------
d)
2x + 3 + 8x = 10 - 5x + 4
10x + 3 = - 5x + 14
10x + 5x = 14 - 3
15x = 11
x = 11/15
-----------------------------------------------
e)
10x = 20
x = 20/10
x = 2
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f)
2y = 40
y = 40/2
y = 20