Exercise 1 Page 85

To solve the equation we need to isolate x on one side of the equation. By subtracting 7 from both sides, we can cancel it from the left-hand side.

x+7=3

SubEqn

LHS-7=RHS-7

x+7-7=3-7

SubTerm

Subtract term

x=-4

Therefore, x=-4 is the solution to the equation. To check that we have the correct solution, we can substitute x=-4 into the original equation and simplify.

g+5=33

Substitute

x= -4

-4+7? =3

CommutativePropAdd

Commutative Property of Addition

7+(-4)? =3

AddNeg

a+(- b)=a-b

7-4? =3

SubTerm

Subtract term

3=3

Since the left-hand side and right-hand side are equal, x=-4 is a correct solution.