Como se suma resta, suma, divisiones?

El orden de operaciones te dice que hagas la multiplicación y la división primero, de izquierda a derecha, antes de hacer la suma y la resta. Continúa haciendo la multiplicación y la división de izquierda a derecha. Ahora, suma y resta de izquierda a derecha.

Step-by-step explanation:

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

x=-7

step-by-step explanation:

x+3=-10

-10+3=-7

x=-7