Question

7x(3+x) + 5x(3+x)=4x(3x+7)+64 solve​

Answer 1

$7x(3 + x) + 5x(3 + x) = 4x(3x + 7) + 64 \\ \\ \implies21x + 7 {x}^{2} + 15x + 5 {x}^{2} = 12 {x}^{2} + 28x + 64 \\ \\ \implies36x + \cancel{12 {x}^{2}} = \cancel{ 12 {x}^{2} } + 28x+ 64 \\ \\ \implies36x - 28x = 64 \\ \\ \implies8x = 64 \\ \\ \implies \: \underline{\boxed{\sf{ x = 8}}}$

Answer 2

refer to attachment!!!