Resolva as equações na incognita x:
a)7 ( a+x) = 5a -2 (2a +x)
b)2a(x+c) - 3ax = 3a(x-2c)
a)7 ( a+x) = 5a -2 (2a +x)
b)2a(x+c) - 3ax = 3a(x-2c)
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7a+7x=5a+4a+2x
7a-9a=2x-7x
2a=5x