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Simplifying x + (3x + 1) = 21 Reorder the terms: x + (1 + 3x) = 21 Remove parenthesis around (1 + 3x) x + 1 + 3x = 21 Reorder the terms: 1 + x + 3x = 21 Combine like terms: x + 3x = 4x 1 + 4x = 21 Solving 1 + 4x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 4x = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 4x = 21 + -1 4x = 21 + -1 Combine like terms: 21 + -1 = 20 4x = 20 Divide each side by '4'. x = 5 Simplifying x = 5
| 7(x+6)=7 | | 5y=-4x+12 | | 4/y=15 | | x+(2x+1)+5x=40 | | 6x^2-9x=81 | | (3x^2-3x-6)/(2x^2-x-6) | | x+2x+1+5x=40 | | 8x^2+6=38 | | 6t-5+5t=105 | | 20x^2=7x+40 | | z^2+i=3+2i | | 2/16-12/16x=1/16 | | 6cos(x)-4=0 | | 0/5*5-3*-2= | | -2x*16=-16 | | 4sin^2=3 | | x*2-13=-4 | | 3x+30=6x-16 | | 2x^2+27+90=0 | | 3+2sinx=5 | | x-6=-15m^2 | | 7b-9b=8 | | 2x^2+3y^2-6x+6x=12 | | 6x+5=30y+59 | | Abs(5x+8)=abs(5x+7) | | 4x-1=4x+-7 | | Y=-2(-0.6666)+2 | | 6x+5=30+59 | | -6x=-21-3 | | -4(3x+1)=-12x | | -4(3x+1)=-12 | | 4x^3-12x^2+3x+5=0 |