-3(3+15)-(10+x)=35

Solution for -3(3+15)-(10+x)=35 equation:

Simplifying
-3(3 + 15) + -1(10 + x) = 35

Combine like terms: 3 + 15 = 18
-3(18) + -1(10 + x) = 35

Multiply -3 * 18
-54 + -1(10 + x) = 35
-54 + (10 * -1 + x * -1) = 35
-54 + (-10 + -1x) = 35

Combine like terms: -54 + -10 = -64
-64 + -1x = 35

Solving
-64 + -1x = 35

Solving for variable 'x'.

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

Add '64' to each side of the equation.
-64 + 64 + -1x = 35 + 64

Combine like terms: -64 + 64 = 0
0 + -1x = 35 + 64
-1x = 35 + 64

Combine like terms: 35 + 64 = 99
-1x = 99

Divide each side by '-1'.
x = -99

Simplifying
x = -99