3-(4+r)=-7

Solution for 3-(4+r)=-7 equation:

Simplifying
3 + -1(4 + r) = -7
3 + (4 * -1 + r * -1) = -7
3 + (-4 + -1r) = -7

Combine like terms: 3 + -4 = -1
-1 + -1r = -7

Solving
-1 + -1r = -7

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '1' to each side of the equation.
-1 + 1 + -1r = -7 + 1

Combine like terms: -1 + 1 = 0
0 + -1r = -7 + 1
-1r = -7 + 1

Combine like terms: -7 + 1 = -6
-1r = -6

Divide each side by '-1'.
r = 6

Simplifying
r = 6