Question

Exercícios - Equação do Primeiro Grau
1. Resolva as seguintes equações.
a) 2x + 3x - 5 = 5
b) 3x - X+6 - 1 = 0
c) 18x - 43 = 65
d) 23x - 16 = 14 - 17x​

Answer 1

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$\tt a)~\sf2x+3x-5=5\\\sf5x=5+5\\\sf5x=10\\\sf x=\dfrac{10}{5}\\\sf x=2\checkmark\\\tt b)~\sf3x-x+6-1=0\\\sf 2x=1-6\\\sf2x=-5\\\sf x=-\dfrac{5}{2}\checkmark\\\tt c)~\sf18x-43=65\\\sf18x=43+65\\\sf18x=108\\\sf x=\dfrac{108}{18}\\\sf x=6\checkmark\\\tt d)~\sf23x-16=14-17x\\\sf23x+17x=14+16\\\sf40x=30\\\sf x=\dfrac{3\diagup\!\!\!\!0}{4\diagup\!\!\!\!0}\\\sf x=\dfrac{3}{4}\checkmark$