Question

Calcule as equações b) 5x +15 = 10x - 10

Answer 1

$\mathsf{5x+15=10x-10}\\\\ \mathsf{5x-10x=-10-15}\\\\ \mathsf{-5x=-25}\\\\ \mathsf{5x=25}\\\\ \mathsf{x=\dfrac{25}{5}}\\\\ \boxed{\mathsf{x=5}}$

Answer 2

5x-10x=-10-15
-5x=-25
5x=25
x=25/5
x=5