Question

calcule as equações do 1 grau: a)x+8=20-3x b)7x-7=2x+23 c)2x+9+x=x+13 d)6x-6=2x+18
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Answer 1

$\boxed{\begin{array}{lr} a)\ x+8=20\\x=20-8\\x=12 \end{array}}\\\\\boxed{\begin{array}{lr} b)\ 7x-7=2x+23\\7x-2x=23+7\\5x=30\\x=\frac{30}{5}\\x=6 \end{array}}\\\\\boxed{\begin{array}{lr} c)\ 2x+9+x=x+13\\3x-x=13-9\\2x=4\\x=\frac{4}{2}\\x=2 \end{array}}\\\\\boxed{\begin{array}{lr} d)\ 6x-6=2x+18\\6x-2x=18+6\\4x=24\\x=\frac{24}{4}\\x=6 \end{array}}$

Resposta Correta;

$a=12\\b=6\\c=2\\d=6$