Question

Resolva f) 4(x+5)+3(x+5)=21 Prfvr

Answer 1

$\color{blue} \boxed{ \boxed{ \color{red} RESPOSTA }}$

x = - 2

$\boxed{\boxed{\bf{\color{cyan}{PASSO \: A \: PASSO}}}}$

4 (x + 5) + 3 (x + 5) = 21

4x + 4 × 5 + 3 (x + 5) = 21

4x + 4 × 5 + 3x + 3 × 5 = 21

4x + 20 + 3x + 3 × 5 = 21

4x + 20 + 3x + 15 = 21

7x + 20 + 15 = 21

7x + 35 = 21

7x = 21 - 35

7x = - 14

x = - 14/7

x = - 2

Answer 2

$\mathsf{4(x+5)+3(x+5)=21}\\\\\mathsf{4x+20+3x+15=21}\\\\\mathsf{7x+35=21}\\\\\mathsf{7x=21-35}\\\\\mathsf{7x=-14}\\\\\mathsf{x=\dfrac{-14}7}\\\\\boxed{\boxed{\mathsf{x=-2}}}$