qual a resposta da equação ?

a) x+30=40


b)30-20+2×=10


c) 3×-10+13=-2×+28.


d)-2×=-4+3×


e) -2×=-4+3×


f) -5×+45-89=-90+41



g)4×-8=10



h) 13×-23-45=-7×+12
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