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Simplifying (3x + 7) + (6x + 20) = 90 Reorder the terms: (7 + 3x) + (6x + 20) = 90 Remove parenthesis around (7 + 3x) 7 + 3x + (6x + 20) = 90 Reorder the terms: 7 + 3x + (20 + 6x) = 90 Remove parenthesis around (20 + 6x) 7 + 3x + 20 + 6x = 90 Reorder the terms: 7 + 20 + 3x + 6x = 90 Combine like terms: 7 + 20 = 27 27 + 3x + 6x = 90 Combine like terms: 3x + 6x = 9x 27 + 9x = 90 Solving 27 + 9x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-27' to each side of the equation. 27 + -27 + 9x = 90 + -27 Combine like terms: 27 + -27 = 0 0 + 9x = 90 + -27 9x = 90 + -27 Combine like terms: 90 + -27 = 63 9x = 63 Divide each side by '9'. x = 7 Simplifying x = 7
| 3-2x=2+3x | | z^2+9z=7 | | f(-5)=1-4(-5) | | 5-36x=60 | | 2n+4n+12=-6 | | 0.15x=0.05x+40 | | y^2-9= | | 8(2)x+7y=184 | | 7-5x+8+2x+4x-3=17 | | x^2+21x+35= | | 3/4=a | | 2(2x-4)=6x-20 | | 8b+11-3b=z+8-2x | | 2(7x+2)+12(x+1)=2 | | x^3+7x^2-x=0 | | 9b=4c | | 2r^2+19r+42=0 | | 5x-15=85 | | 2p-9=5p+-2 | | x+4(x+1)=29 | | 4-(2x)=10-x | | 7.6x-3.7=-70.2 | | 12y-1+13=5y+2 | | 6x^2+6x-22=0 | | -36y-7+10=-8 | | (4x+15)+(3x+25)=180 | | -(5y-6)+4(3+5y)ify=2 | | 6k-5k=5 | | 4+.8(2n-25)=-8 | | 24+12x=49+21x+3 | | f(-5)=2(-5)+3 | | -5(x+7)=-5*x+35 |