7x-3(-x-13)=21

Simple and best practice solution for 7x-3(-x-13)=21 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 7x-3(-x-13)=21 equation:


Simplifying
7x + -3(-1x + -13) = 21

Reorder the terms:
7x + -3(-13 + -1x) = 21
7x + (-13 * -3 + -1x * -3) = 21
7x + (39 + 3x) = 21

Reorder the terms:
39 + 7x + 3x = 21

Combine like terms: 7x + 3x = 10x
39 + 10x = 21

Solving
39 + 10x = 21

Solving for variable 'x'.

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

Add '-39' to each side of the equation.
39 + -39 + 10x = 21 + -39

Combine like terms: 39 + -39 = 0
0 + 10x = 21 + -39
10x = 21 + -39

Combine like terms: 21 + -39 = -18
10x = -18

Divide each side by '10'.
x = -1.8

Simplifying
x = -1.8

See similar equations:

| 27=9xX | | 2=-2.5 | | 4/10=3/w | | 20+125x=1500+250x | | 3y^3=27y^2+30y | | 32=4x-2 | | 7x+4x-57=76-8x | | 4(3x+5)=15x+15-3x+5 | | 4+7x=75 | | 360=3x+3(2x) | | 1-1=1-2 | | -8x+12+9x=5+x+7 | | 36-4(2)(-1)=x | | 7x+5x-7=3(4x+4) | | 121+y^2=x^2 | | 16y^2/2y | | (x^3)*3.14*4/3=2670.57 | | -5(7h-6)=26-2h | | 5x+1=3x-31 | | 3+4(T+2)=2T-3(T-6) | | 3+4(T+2)=2T-3(T-5) | | 155=4x+y | | (8y+6)-(4y-7)= | | 2a+b=9000 | | 1+2g=3 | | sin(x)=.707 | | 3f+2f=100 | | 3/-.750 | | 1/5=7/5-1/10x | | 2x^2=676 | | 7(4w+4)=-1 | | 3x=19+2r |

Equations solver categories