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Simplifying a + (21 + 2a) = 180 Remove parenthesis around (21 + 2a) a + 21 + 2a = 180 Reorder the terms: 21 + a + 2a = 180 Combine like terms: a + 2a = 3a 21 + 3a = 180 Solving 21 + 3a = 180 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 3a = 180 + -21 Combine like terms: 21 + -21 = 0 0 + 3a = 180 + -21 3a = 180 + -21 Combine like terms: 180 + -21 = 159 3a = 159 Divide each side by '3'. a = 53 Simplifying a = 53
| 0.5n-9=4n+5-4 | | 12x+(-12y)-5x-(-3y)+20= | | p^3+4p^2= | | 76(25)-7w=800 | | 4x+z-y=116 | | 116-4y=x | | 2(4-4x-8x)+3(7x+2)=5 | | x+4=1.5x | | 25+-55= | | 10z+5+4z=-1+4z+16 | | -5x=310 | | -5x=350 | | 5(4)(1xb)= | | 175m-125m+42750=45900-175m | | A=2B+B | | a=prt+r | | 4x(2x+1)= | | 12x-3x+96=12x+51 | | -5p=q+20 | | 6.6+4.2x=x+18.6 | | -5P=q-20 | | 4x^2+10x+31=0 | | 4*8+y=8 | | 1x+0=8 | | 12(2b+4)= | | 617252.6592=2604.4416*h | | -1/2(18r-12)=3(2-3r) | | q^2+48=0 | | z^2+34z=0 | | 5x-3(x-3)=-9+4x+10 | | 7x+6=-8+2x+24 | | 617525.6592=2604.4416*h |