3(7+r)=90

Simple and best practice solution for 3(7+r)=90 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 3(7+r)=90 equation: 


Simplifying
3(7 + r) = 90
(7 * 3 + r * 3) = 90
(21 + 3r) = 90

Solving
21 + 3r = 90

Solving for variable 'r'.

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

Add '-21' to each side of the equation.
21 + -21 + 3r = 90 + -21

Combine like terms: 21 + -21 = 0
0 + 3r = 90 + -21
3r = 90 + -21

Combine like terms: 90 + -21 = 69
3r = 69

Divide each side by '3'.
r = 23

Simplifying
r = 23

See similar equations:

| x+2/2x^2+13x+20-x+3/2x^2+13x+20 | | 2(5xn)+5(6-n)=40 | | A=1/2*28*28 | | 4(2t+-1)+3t=8-t | | 25x^2-30x+7=0 | | (x^2)-12x+30=0 | | 2x-8=3x+4(x-2) | | 3/4*n=1 | | 19x-3=10x-21 | | 3+17=-5(4x-4) | | 8+4z-2=9z+8-4z | | 3/4n=1 | | 5x-30*34= | | 0.80x+0.60(120)=0.40(132) | | 8x^2y+12x^3y^2=4x^2y | | 24x+1=-24x+1 | | 7x+x-3=21 | | 30(5x*34)= | | 4(x+4)/5=2x-2 | | X^2=-8x+9 | | 34+x=456 | | 0=-16x^2+200x+6 | | 3x+8=17x-19 | | -1/3x-5=6 | | .25x^2+x^2=180 | | 5+10=-3(2x-5) | | 12x-16=47 | | 80=-16t^2+48t+80 | | 3(x+3)-2x+5=x+8 | | x-30/5=34 | | 4y+3=3y-8 | | 3(x+3)-2x+7=x+8 |

Equations solver categories