21-(-18)=

Simple and best practice solution for 21-(-18)= equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for 21-(-18)= equation: 


Simplifying
21 + -1(-18) = 0

Multiply -1 * -18
21 + 18 = 0

Combine like terms: 21 + 18 = 39
39 = 0

Solving
39 = 0

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

See similar equations:

| 22+28x=14+32x | | x-5(0)-6=0 | | -8.1-(-10.7)= | | 0=28+12x-x^2 | | 7[x-4]= | | y=28+12x-x^2 | | 54-3e=6a | | 30x-6=0 | | -9x^2+4x+9=0 | | 100=20x+5y | | I=(1071)(0.22)(1.25) | | 20-4x=y | | -2=-4-42 | | (m)3/8=-2 | | -4+8=24 | | 89=(2234)(r)(0.075) | | 121x-49y=1 | | 69=(1788)(r)(0.0777777778) | | 89=(2126)(r)(0.1111111111) | | (M+2n)(m^2+5mn-2n)= | | 69=1553(r)(0.0611111111) | | 7(x+2)+4=5x+1 | | 3-6(4-x)=9(6+x)+2x | | (4x^2y)(3x^6y^2)= | | 3q-2-9p+9q-6p= | | 3p+4=10 | | -1.98-7.9= | | (2x-5y)(3x^2-6xy-4y)= | | 29=(490)(r)(0.125) | | 7(x+3)-9=5 | | I=(490)(29)(0.125) | | 8+16y-7=7y+43-5y |

Equations solver categories