Question

Oi.. Você pode me ajudar?

1º) Resolva em R equações a seguir:
a) 3 + x = 0
b) 23x +2 = 2
c) 12 -7 + 4x = 25
d) 5x – 3x = 30
e) 4x + 10 = 45 – 3x
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Answer 1

$\Large\boxed{\begin{array}{l}\tt a)~\sf 3+x=0\\\sf x=-3\\\tt b)~\sf 23x+2=2\\\sf 23x=2-2\\\sf 23x=0\\\sf x=\dfrac{0}{23}\\\\\sf x=0\\\tt c)~\sf 12-7+4x=25\\\sf 4x=25+7-12\\\sf 4x=20\\\sf x=\dfrac{20}{4}\\\\\sf x=5\\\tt d)~\sf 5x-3x=30\\\sf 2x=30\\\sf x=\dfrac{30}{2}\\\\\sf x=15\\\tt e)~\sf 4x+10=45-3x\\\sf 4x+3x=45-10\\\sf 7x=35\\\sf x=\dfrac{35}{7}\\\\\sf x=5\end{array}}$