3x+7x-7=21

Simple and best practice solution for 3x+7x-7=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 3x+7x-7=21 equation:


Simplifying
3x + 7x + -7 = 21

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

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

Solving
-7 + 10x = 21

Solving for variable 'x'.

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

Add '7' to each side of the equation.
-7 + 7 + 10x = 21 + 7

Combine like terms: -7 + 7 = 0
0 + 10x = 21 + 7
10x = 21 + 7

Combine like terms: 21 + 7 = 28
10x = 28

Divide each side by '10'.
x = 2.8

Simplifying
x = 2.8

See similar equations:

| 432/73 | | 5(x-2)-8=6x-(5k-3) | | 73/432 | | 4x^2+31x-45=0 | | 3x+4y=93 | | 6x-y=46 | | 2x^2+23+7= | | 3x+4y=93xy | | (x*0.2)+x=2000 | | 21.95=.85d+4.95 | | 2.95=.85d+4.95 | | (x*0.2)+x=1000 | | 7x+2=90 | | f(x)=-2x*2-8x-10 | | 12x^3+32x^2+84x=0 | | 4.9t^2-40t-30=0 | | y-18y^2+80y=0 | | 12=120/10 | | 3.75x=1.25 | | y=-2x^2-16x+13 | | 7y^4+11y^3-6y^2=0 | | 4x+5(3)=-7 | | 5x-y=38 | | 7m-10=60 | | P=EI-RI^2 | | 2y^4+3y^3-9y^2=0 | | 9x+5=33+2x | | -5(r+6)=-86 | | 10x-2=4x-4 | | 3y^4-7y^3-6y^2=0 | | ab-xy=equation | | 12x^3+12x^2+12x=0 |

Equations solver categories