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Simplifying (x + 3) + (x + 8) = 21 Reorder the terms: (3 + x) + (x + 8) = 21 Remove parenthesis around (3 + x) 3 + x + (x + 8) = 21 Reorder the terms: 3 + x + (8 + x) = 21 Remove parenthesis around (8 + x) 3 + x + 8 + x = 21 Reorder the terms: 3 + 8 + x + x = 21 Combine like terms: 3 + 8 = 11 11 + x + x = 21 Combine like terms: x + x = 2x 11 + 2x = 21 Solving 11 + 2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + 2x = 21 + -11 Combine like terms: 11 + -11 = 0 0 + 2x = 21 + -11 2x = 21 + -11 Combine like terms: 21 + -11 = 10 2x = 10 Divide each side by '2'. x = 5 Simplifying x = 5
| 5^7x-9=1/125 | | ln(8x+1)=6 | | 92x=36 | | 6-3x-5x-x=10 | | 2ef+3ef= | | 5x+(7x+2)+(7x+6)= | | 2m^2=-4m+6m | | 7q-4q+8= | | 3b^4+18b^3+27b^2= | | log(2x-4)=-0.7 | | 2x+5=-2x-8-x | | -40=8(x-3)-3/2(6x-16 | | .16x+1500=x | | (X)2+(Y-1)2=81 | | 0=16t^2+96t-140 | | 5k^2+20k+100=0 | | 5k^2+20k+100=100 | | (x-5)-(x-12)= | | (t/2-20)/4=4 | | 5*7x^2y=175 | | 21/15=3x-2/5 | | 12/3x=36/63 | | 5m(4m+11)= | | Y=(8-x)^1/2 | | 4x=x+180 | | 13.2x+x^2-1246=0 | | 34x-9x+12=20+3x | | 4t-6h+8t-12h+4= | | 1/2(-0.86) | | 35=-29+(n-1)(-7) | | 13.2x+x^2-1296=0 | | 5u+16=61 |